Exhibit 4.1

EXECUTION VERSION

WILLIS NORTH AMERICA INC.

Officers’ Certificate

May 29, 2020

Each of the undersigned does hereby certify, as applicable, pursuant to Sections 2.01 and 3.01 of the Indenture, dated as of May 16, 2017, by and among Willis North America Inc., a Delaware corporation (the “Issuer”), the guarantors named therein and Wells Fargo Bank, National Association, as Trustee (the “Trustee”) (the “Original Indenture”), as supplemented by the Fourth Supplemental Indenture, dated as of September 10, 2019, by and among the Issuer, the guarantors named therein and the Trustee (the “Fourth Supplemental Indenture” and, together with the Original Indenture, the “Indenture”), that:

(b) If the Notes are redeemed, in whole at any time or in part from time to time, on or after June 15, 2029, the Redemption Price for the Notes to be redeemed will equal 100% of the principal amount of such Notes to be redeemed plus accrued and unpaid interest, if any, to, but excluding, such Redemption Date.

(b) Subject to the procedures of the Depositary, a Global Security representing the Notes shall be exchangeable for Notes registered in the names of Persons other than the Depositary or its nominee only if (i) the Depositary notifies the Trustee and the Issuer in writing that it is no longer willing or able to properly discharge its responsibilities as a Depositary for such Global Security and no qualified successor Depositary shall have been appointed by the Issuer within ninety (90) days of receipt by the Issuer of such notification, or if at any time the Depositary ceases to be a clearing agency registered under the Exchange Act at a time when the Depositary is required to be so registered to act as such Depositary and no qualified successor Depositary shall have been appointed by the Issuer within ninety (90) days after it becomes aware of such cessation, (ii) the Issuer executes and delivers to the Trustee an Issuer Order stating that the Issuer elects to terminate the book-entry system through the Depositary, or (iii) there shall have occurred and be continuing an Event of Default with respect to such Global Security. Any Global Security that is exchangeable pursuant to the preceding sentence shall be exchangeable for the Notes it represents, as provided in the Original Indenture.

THIS OFFICERS’ CERTIFICATE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK. EACH OF THE ISSUER, THE GUARANTORS AND THE TRUSTEE IRREVOCABLY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATING TO THIS OFFICERS’ CERTIFICATE OR THE TRANSACTIONS CONTEMPLATED HEREBY.

Unless otherwise defined herein, capitalized terms used in this certificate have the meaning assigned to them in the Indenture.

[Signature page follows]

[Signature Page to Officers’ Certificate Establishing Terms of 2.950% Senior Notes due 2029]

[Signature Page to Officers’ Certificate Establishing Terms of 2.950% Senior Notes due 2029]

[Signature Page to Officers’ Certificate Establishing Terms of 2.950% Senior Notes due 2029]

[Signature Page to Officers’ Certificate Establishing Terms of 2.950% Senior Notes due 2029]

[Signature Page to Officers’ Certificate Establishing Terms of 2.950% Senior Notes due 2029]

Exhibit A

[FORM OF FACE OF 2029 NOTE]

THIS NOTE IS A GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITARY OR A NOMINEE THEREOF. UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE OR IN PART FOR SECURITIES IN CERTIFICATED FORM IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE, THIS SECURITY MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE DEPOSITARY TO A NOMINEE OF THE DEPOSITARY OR BY A NOMINEE OF THE DEPOSITARY TO THE DEPOSITARY OR ANOTHER NOMINEE OF THE DEPOSITARY OR BY THE DEPOSITARY OR ANY SUCH NOMINEE TO A SUCCESSOR DEPOSITARY OR A NOMINEE OF SUCH SUCCESSOR DEPOSITARY.

UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), TO THE ISSUER OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

WILLIS NORTH AMERICA INC.

2.950% Senior Note due 2029

CUSIP No.: 970648 AJ0

ISIN No.: US970648AJ01

No.

Dated:

WILLIS NORTH AMERICA INC., a Delaware corporation (herein called the “Issuer,” which term includes any successor Person under the Indenture hereinafter referred to), for value received, hereby promises to pay to CEDE & CO., or its registered assigns, the principal sum of $[_________] or such other principal sum as shall be set forth in the Schedule of Increases and Decreases attached hereto on September 15, 2029, and to pay interest thereon from September 10, 2019 or from the most recent Interest Payment Date to which interest has been paid or duly provided for, semi-annually on March 15 and September 15 in each year, commencing on March 15, 2020 and at the Stated Maturity of this Note, at the rate of 2.950% per annum, until the principal hereof is paid or made available for payment. The interest so payable, and punctually paid or duly provided for, on any Interest Payment Date will, as provided in such Indenture, be paid to the Person in whose name this Note (or one or more Predecessor Securities) is registered at the close of business on the Regular Record Date for such interest, which shall be March 1 or September 1 (whether or not a Business Day), as the case may be, immediately preceding such Interest Payment Date. Any such interest due on an Interest Payment Date not so punctually paid or duly provided for will forthwith cease to be payable to the Holder on such Regular Record Date and may either be paid to the Person in whose name this Note is registered at the close of business on a Special Record Date for the payment of such Defaulted Interest to be fixed by the Issuer, notice whereof shall be given to Holders of Securities of this series not less than 10 days prior to, but excluding, such Special Record Date, or be paid at any time in any other lawful manner not inconsistent with the requirements of any securities exchange on which the Securities of this series may be listed, and upon such notice as may be required by such exchange, all as more fully provided in said Indenture.

Payment of the principal of (and premium, if any) and interest on this Note will be made at the office or agency of the Issuer maintained for that purpose in the City and State of New York, or at such other agency as the Issuer may determine, in such coin or currency of the United States of America as at the time of payment is legal tender for payment of public and private debts; provided, however, that at the option of the Issuer payment of interest may be made (subject to surrender where applicable) by check mailed to the address of the Person entitled thereto as such address shall appear in the Security Register or by wire transfer at such place and to such account at a banking institution in the United States as may be designated in writing to the Trustee referred to on the reverse hereof at least sixteen (16) days prior to the date of payment by the Person entitled thereto. Notwithstanding the foregoing, payment of any amount payable in respect of a Global Security will be made in accordance with the applicable procedures of the Depositary.

The Trustee shall act as Paying Agent with respect to the Securities of this series.

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Reference is hereby made to the further provisions of this Note set forth on the reverse hereof, which further provisions shall for all purposes have the same effect as if set forth at this place.

Unless the certificate of authentication hereon has been executed by the Trustee referred to on the reverse hereof by manual signature, this Note shall not be entitled to any benefit under the Indenture or be valid or obligatory for any purpose.

IN WITNESS WHEREOF, the Issuer has caused this instrument to be duly executed as of the date first written above.

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TRUSTEE’S CERTIFICATE OF AUTHENTICATION

This is one of the Securities of the series designated therein issued under the within-mentioned Indenture.

Dated:

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[FORM OF REVERSE OF NOTE]

WILLIS NORTH AMERICA INC.

2.950% Senior Note due 2029

This global security certificate represents one of a duly authorized issue of securities of the Issuer (herein called the “Securities”), issued and to be issued in one or more series under an Indenture, dated as of May 16, 2017 (as amended or supplemented to the date hereof, the “Original Indenture”), as supplemented by the Fourth Supplemental Indenture, dated as of September 10, 2019 (herein called the “Fourth Supplemental Indenture”) (such Original Indenture, together with the Fourth Supplemental Indenture, the “Indenture”), among the Issuer and WILLIS TOWERS WATSON PUBLIC LIMITED COMPANY, a company organized and existing under the laws of Ireland and parent company of the Issuer (without any of its consolidated subsidiaries, “Parent,” and together with its consolidated subsidiaries, the “Company”), WILLIS TOWERS WATSON SUB HOLDINGS UNLIMITED COMPANY, a company organized and existing under the laws of Ireland, WILLIS NETHERLANDS HOLDINGS B.V., a company organized under the laws of the Netherlands, WILLIS INVESTMENT UK HOLDINGS LIMITED, a company organized and existing under the laws of England and Wales, TA I LIMITED, a company organized and existing under the laws of England and Wales, WILLIS TOWERS WATSON UK HOLDINGS LIMITED, a company organized and existing under the laws of England and Wales, TRINITY ACQUISITION PLC, a company organized and existing under the laws of England and Wales, and WILLIS GROUP LIMITED, a company organized and existing under the laws of England and Wales, as guarantors (together with Parent, the “Guarantors”) and WELLS FARGO BANK, NATIONAL ASSOCIATION, as Trustee (herein called the “Trustee,” which term includes any successor trustee under the Indenture), and reference is hereby made to the Indenture for a statement of the respective rights, limitations of rights, duties and immunities thereunder of the Issuer, the Guarantors, the Trustee and the Holders of the Securities and of the terms upon which the Securities are, and are to be, authenticated and delivered. This Note is one of the series designated on the face hereof (herein called the “Notes”).

The Notes may be redeemed at the option of the Issuer in whole, but not in part, at any time upon not less than 30 nor more than 60 days’ prior notice delivered electronically or by first-class mail, with a copy to the Trustee, to the registered address of each Holder or otherwise delivered in accordance with the applicable procedures of the Depositary, if:

(i) on the occasion of the next payment due under the Notes, the Issuer, or any Guarantor, has or will become obliged to pay Additional Amounts (as defined below) as a result of any change in, or amendment to, the laws or regulations of the Taxing Jurisdiction (defined below), or any change in the official application or official interpretation of such laws or regulations, which change or amendment is announced and becomes effective on or after the date of issuance of the Notes; and

(ii) such obligation cannot be avoided by the Issuer, or the relevant Guarantor, taking reasonable measures available to it;

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provided that no such notice of redemption shall be given earlier than 90 days prior to the earliest date on which the Issuer or a Guarantor

would be obliged to pay such Additional Amounts were a payment in respect of the Notes then due.

Prior to the giving of any notice of redemption pursuant to the Indenture, the Issuer shall deliver to the Trustee an Officers’ Certificate of the Issuer stating that the Issuer is entitled to effect such redemption and setting forth a statement of facts showing that the conditions precedent to the right of the Issuer so to redeem have occurred. Notes redeemed pursuant to this provision will be redeemed at a Redemption Price equal to 100% of the principal amount of Notes redeemed plus accrued and unpaid interest thereon to, but excluding, the date of redemption and all Additional Amounts due on the date of redemption.

Upon the occurrence of a Change of Control Triggering Event, unless the Issuer has exercised its right to redeem the Notes pursuant to Sections 1.01 and 1.05 of the Fourth Supplemental Indenture or Article ELEVEN of the Original Indenture, each Holder will have the right to require that the Issuer repurchase all or any part (in excess of $2,000 and in integral multiples of $1,000 principal amount) of that Holder’s Notes at a repurchase price in cash equal to 101% of the aggregate principal amount of Notes repurchased plus any accrued and unpaid interest on the Notes repurchased to but excluding the date of repurchase. Within 30 days following any Change of Control Triggering Event or, at the Issuer’s option, prior to any Change of Control, but after the public announcement of the Change of Control, the Issuer will send a notice to each Holder describing the transaction or transactions that constitute or may constitute the Change of Control Triggering Event and offering to repurchase Notes on the payment date specified in the notice, which date will be no earlier than 30 days and no later than 45 days from the date such notice is sent. The notice shall, if sent prior to the date of consummation of the Change of Control, state that the offer to repurchase is conditioned on the Change of Control Triggering Event occurring on or prior to the payment date specified in the notice.

The Issuer will comply with the requirements of Rule 14e-1 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and any other securities laws and regulations to the extent those laws and regulations are applicable in connection with the repurchase of the Notes as a result of a Change of Control Triggering Event. To the extent that the provisions of any securities laws or regulations conflict with the Change of Control Triggering Event provisions of the Notes, the Issuer will comply with the applicable securities laws and regulations and will not be deemed to have breached its obligations under the Change of Control Triggering Event provisions of the Notes by virtue of such conflict.

On the Change of Control Triggering Event payment date, the Issuer will, to the extent lawful:

(i) accept for payment all Notes or portions of Notes properly tendered pursuant to the Issuer’s offer;

(ii) deposit with the Paying Agent an amount equal to the aggregate purchase price in respect of all Notes or portions of Notes properly tendered; and

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(iii) deliver or cause to be delivered to the Trustee, the Notes properly accepted, together with an Officers’ Certificate stating the aggregate principal amount of Notes being purchase by the Issuer.

The Paying Agent will promptly pay, from funds deposited by the Issuer for such purpose, to each Holder of Notes properly tendered the purchase price for the Notes, and the Trustee will promptly authenticate and send (or cause to be transferred by book-entry) to each Holder a new note equal in principal amount to any unpurchased portion of any Notes surrendered.

The Issuer will not be required to make an offer to repurchase the Notes upon a Change of Control Triggering Event if a third party makes an offer in the manner, at the times and otherwise in compliance with the requirements for an offer made by the Issuer and such third party purchases all Notes properly tendered and not withdrawn under its offer.

The definitions of certain terms used in the paragraphs above are listed below.

“Change of Control” means the occurrence of any of the following:

(i) the consummation of any transaction (including without limitation, any merger or consolidation) the result of which is that any person (including any “person” (as that term is used in Section 13(d)(3) of the Exchange Act)) becomes the “beneficial owner” (as defined in Rules 13d-3 and 13d-5 under the Exchange Act), directly or indirectly, of Capital Stock representing more than 50% of the aggregate ordinary voting power represented by the issued and outstanding Capital Stock of Parent;

(ii) the first day on which Parent ceases to own, directly or indirectly, at least 80% of the outstanding Capital Stock of the Issuer; or

(iii) the adoption of a plan relating to the liquidation or dissolution of Parent.

“Change of Control Triggering Event” means the occurrence of both a Change of Control and a Ratings Decline.

“Investment Grade” means a rating of Baa3 or better by Moody’s (or its equivalent under any successor rating categories of Moody’s) and BBB- or better by S&P (or its equivalent under any successor rating categories of S&P) (or, in each case, if such Rating Agency ceases to rate the Notes for reasons outside of the Company’s control, the equivalent investment grade credit rating from any Rating Agency selected by the Company as a replacement Rating Agency).

“Moody’s” means Moody’s Investors Service Inc.

“Officers’ Certificate” means a certificate signed by the Chairman of the Board, the Chief Executive Officer, the President, a director, a Vice President, the Chief Financial Officer, the Group General Counsel and by the Treasurer, an Assistant Treasurer, the Secretary or an Assistant Secretary of the Issuer or any Guarantor, as applicable, and delivered to the Trustee.

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“Rating Agency” means:

(i) each of Moody’s and S&P; and

(ii) if either of Moody’s or S&P ceases to rate the Notes or fails to make a rating of the Notes publicly available for reasons outside of the Company’s control, a “nationally recognized statistical rating organization” within the meaning of Rule 15c3-1 (c) (2) (vi) (F) under the Exchange Act selected by the Company as a replacement agency for Moody’s or S&P, or both, as the case may be.

“Ratings Decline” means at any time during the period commencing on the earlier of (i) the occurrence of a Change of Control or (ii) public notice of the occurrence of a Change of Control or the intention by Parent to effect a Change of Control, and ending 60 days thereafter (which period shall be extended so long as the rating of the Notes is under publicly announced consideration for a possible downgrade by any of the Rating Agencies), that (a) the rating of the Notes shall be reduced by both Rating Agencies and (b) the Notes shall be rated below Investment Grade by each of the Rating Agencies.

“S&P” means Standard & Poor’s Ratings Services, a division of S&P Global Inc. and its subsidiaries.

With respect to any payments made by or on the behalf of the Issuer or a Guarantor in respect of the Notes or any Guarantee of the Notes, as applicable, the Issuer or such Guarantor will make all payments of principal of, premium, if any, and interest on (whether on scheduled payment dates or upon acceleration) and the Redemption Price, if any, payable in respect of any Note without deduction or withholding for or on account of any present or future tax, duty, levy, import, assessment or other governmental charge (including penalties, interest and other liabilities related thereto) (“Taxes”) imposed, levied, collected, withheld or assessed by or on behalf of any jurisdiction in which the Issuer or such Guarantor is incorporated or organized, engaged in business for tax purposes or otherwise resident for tax purposes, or any political subdivision thereof or taxing authority therein and any jurisdiction through which any payment is made on behalf of the Issuer or any Guarantor (including the jurisdiction of any Paying Agent) (each, a “Taxing Jurisdiction”), upon or as a result of such payments, unless required by law or by the official interpretation or administration thereof.

To the extent that any such Taxes are so levied or imposed, the Issuer or such Guarantor will pay such additional amounts (“Additional Amounts”) in order that the net amount received by each Holder (including Additional Amounts), after withholding for or on account of such Taxes imposed upon or as a result of such payment, will not be less than the amount that would have been received had such taxes not been imposed or levied; except that no such Additional Amounts shall be payable with respect to a payment made to a Holder or beneficial owner of a Note:

(i) to the extent that such Taxes are imposed pursuant to Sections 1471 through 1474 of the Internal Revenue Code of 1986, as amended (the “Code”), any current or future regulations or official interpretations thereof, any fiscal or regulatory legislation, rules or practices adopted pursuant to an intergovernmental agreement between a non-U.S. jurisdiction and the United States, with respect to the forgoing or any agreements entered into pursuant to Section 1471(b)(1) of the Code (“FATCA”) and/or the UK’s International Tax Compliance Regulations 2015; or

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(ii) to the extent that such Taxes would not have been so imposed, levied or assessed but for the existence of some connection between such Holder or beneficial owner of such Note and the Taxing Jurisdiction imposing such Taxes other than the mere holding or enforcement of such Note or receipt of payments thereunder; or

(iii) to the extent that such Taxes would not have been so imposed, levied or assessed but for the failure of the Holders or beneficial owners of such Note to comply with a reasonable written request by the Issuer (or its agent) to make a valid declaration of non-residence or any other claim or filing for exemption to which it is entitled (but only to the extent it is legally entitled to do so); or

(iv) that presents such Note for payment (where presentation is required) more than 30 days after the date on which such payment became due and payable or the date on which payment of the Note is duly provided for and notice is given to Holders, whichever occurs later, except to the extent that the Holder or beneficial owner of such Note would have been entitled to such Additional Amounts on presenting such Note on any date during such 30-day period; or

(v) in the case of a payment made by or on behalf of the Issuer or any Guarantor organized under the laws of the United States, any state thereof or the District of Columbia, with respect to any United States withholding taxes, so long as such withholding taxes are summarized in the prospectus supplement, dated September 3, 2019, in the discussion under the caption “Certain Material Income Tax Consequences—United States Taxation” or the Issuer or such Guarantor (pursuant to Section 1.06 of the Original Indenture) provides reasonable notice regarding potential United States withholding taxes and requests Holders and beneficial owners to provide applicable U.S. tax forms; or

(vi) any combination of the above.

As used herein and for purposes of this Note, any reference to the principal of and interest on the Notes and the Redemption Price, if any, shall be deemed to include a reference to any related Additional Amounts payable in respect of such amounts. The Issuer will also pay any stamp, registration, excise or property taxes and any other similar levies (including any interest and penalties related thereto) imposed by any Taxing Jurisdiction on the execution, delivery, registration or enforcement of any of the Notes, the Indenture or any other document or instrument referred to therein.

The Issuer may, from time to time, without notice to or the consent of the Holders of the Notes, increase the principal amount of the Notes under the Indenture and issue such increased principal amount (or any portion thereof), in which case any additional Notes so issued will have the same form and terms (other than the date of issuance and the issue price and, under certain circumstances, the date from which interest thereon will begin to accrue and the initial Interest Payment Date), and will carry the same right to receive accrued and unpaid interest, as the Notes previously issued, and such additional Notes will form a single series with the previously issued Notes, including for voting purposes.

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No sinking fund is provided for the Notes. The Notes are subject to redemption upon not less than 30 nor more than 60 days’ notice given as provided in the Indenture, as a whole at any time, or in part from time to time.

If the Notes are redeemed, in whole at any time or in part from time to time, prior to June 15, 2029, the Redemption Price for the Notes to be redeemed will be equal to the greater of: (i) 100% of the aggregate principal amount of the Notes to be redeemed, and (ii) an amount equal to the sum of the present value of (A) the payment on June 15, 2029 of principal of the Notes to be redeemed and (B) the payment of the remaining scheduled payments through June 15, 2029 of interest on the Notes to be redeemed (excluding accrued and unpaid interest to the date of redemption (the “Redemption Date”) and subject to the right of Holders on the relevant Record Date to receive interest due on the relevant Interest Payment Date) discounted from their scheduled date of payment to the Redemption Date on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) using a discount rate equal to the Treasury Rate plus 25 basis points plus, in each of the above cases, accrued and unpaid interest, if any, to, but excluding, such Redemption Date.

If the Notes are redeemed on or after June 15, 2029, the Redemption Price for the Notes to be redeemed will equal 100% of the principal amount of such Notes to be redeemed plus accrued and unpaid interest, if any, to, but excluding, such Redemption Date.

The definitions of certain terms used in the paragraph above are listed below.

“Comparable Treasury Issue” means the United States Treasury security selected by the Independent Investment Banker as having a maturity comparable to the remaining term of the Notes to be redeemed (assuming a maturity date of June 15, 2029) that would be utilized, at the time of selection and in accordance with customary financial practice, in pricing new issues of corporate debt securities of comparable maturity to the remaining term of such Notes.

“Comparable Treasury Price” means, with respect to any Redemption Date for the Notes, (1) the average of five Reference Treasury Dealer Quotations for such Redemption Date, after excluding the highest and lowest Reference Treasury Dealer Quotations, or (2) if the Independent Investment Banker obtains fewer than five such Reference Treasury Dealer Quotations, the average of all such quotations.

“Independent Investment Banker” means one of the Reference Treasury Dealers that the Issuer appoints to act as the Independent Investment Banker from time to time.

“Reference Treasury Dealer” means (1) each of BofA Securities, Inc., Barclays Capital Inc., Citigroup Global Markets Inc. and J.P. Morgan Securities LLC and their respective successors and one primary dealer of U.S. government securities in the United States (a “Primary Treasury Dealer”) selected by PNC Capital Markets LLC; provided, however, that if any of the foregoing ceases to be a Primary Treasury Dealer, the Issuer shall substitute another Primary Treasury Dealer and (2) any other Primary Treasury Dealers selected by the Issuer.

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“Reference Treasury Dealer Quotations” means, with respect to each Reference Treasury Dealer and any Redemption Date, the average, as determined by the Independent Investment Banker, of the bid and asked prices for the Comparable Treasury Issue (expressed in each case as a percentage of its principal amount) quoted in writing to the Independent Investment Banker at 5:00 p.m., New York City time, on the third Business Day preceding such Redemption Date.

“Treasury Rate” means, with respect to any Redemption Date: (a) the yield, under the heading which represents the average for the immediately preceding week, appearing in the most recently published statistical release designated “H. 15 (519)” or any successor publication which is published weekly by the Board of Governors of the Federal Reserve System and which establishes yields on actively traded U.S. Treasury securities adjusted to constant maturity under the caption “Treasury Constant Maturities,” for the maturity corresponding to the Comparable Treasury Issue (if no maturity is within three months before or after the remaining term of the Notes yields for the two published maturities most closely corresponding to the Comparable Treasury Issue will be determined and the Treasury Rate will be interpolated or extrapolated from such yields on a straight line basis, rounding to the nearest month); or (b) if such release (or any successor release) is not published during the week preceding the calculation date or does not contain such yields, the rate per annum equal to the semi-annual equivalent yield to maturity of the Comparable Treasury Issue, calculated using a price for the Comparable Treasury Issue (expressed as a percentage of its principal amount) equal to the Comparable Treasury Price for such Redemption Date. The Treasury Rate will be calculated on the third Business Day preceding the Redemption Date.

In the event of redemption of this Note in part only, a new Note or Notes of like tenor for the unredeemed portion hereof will be issued in the name of the Holder hereof upon the cancellation hereof.

The Issuer shall send notice of redemption not less than 30 nor more than 60 days prior to the Redemption Date, to each Holder of the Notes to be redeemed, all as provided in the Indenture.

The Indenture contains provisions for defeasance at any time of the entire Indebtedness of this Note or certain restrictive covenants and Events of Default with respect to this Note, in each case upon compliance with certain conditions set forth in the Indenture.

If an Event of Default with respect to the Notes shall occur and be continuing, the principal of the Notes may be declared due and payable in the manner and with the effect provided in the Indenture.

The Indenture permits, with certain exceptions as therein provided, the amendment thereof and the modification of the rights and obligations of the Issuer and the Guarantors and the rights of the Holders of the Securities of each series to be affected under the Indenture at any time by the Issuer, the Guarantors and the Trustee with the consent of the Holders of not less than a majority in principal amount of the Securities at the time Outstanding of each series to be affected. The Indenture also contains provisions permitting the Holders of specified percentages in principal amount of the Securities of each series at the time Outstanding, on behalf of the Holders of all Securities of such series, to waive compliance by the Issuer with certain provisions

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of the Indenture and certain past defaults under the Indenture and their consequences. Any such consent or waiver by the Holder of this Note shall be conclusive and binding upon such Holder and upon all future Holders of this Note and of any Note issued upon the registration of transfer hereof or in exchange herefor or in lieu hereof, whether or not notation of such consent or waiver is made upon this Note.

As provided in and subject to the provisions of the Indenture, the Holder of this Note shall not have the right to institute any proceeding with respect to the Indenture or for the appointment of a receiver or trustee or for any other remedy thereunder, unless such Holder shall have previously given the Trustee written notice of a continuing Event of Default with respect to the Notes, the Holders of not less than a majority in principal amount of the Notes at the time Outstanding shall have made written request to the Trustee to institute proceedings in respect of such Event of Default as Trustee and offered the Trustee indemnity, and the Trustee shall not have received from the Holders of a majority in principal amount of Notes at the time Outstanding a direction inconsistent with such request, and shall have failed to institute any such proceeding, for 60 days after receipt of such notice, request and offer of indemnity. The foregoing shall not apply to any suit instituted by the Holder of this Note for the enforcement of any payment of principal hereof (or premium, if any) or interest hereon on or after the respective due dates expressed or provided for herein.

No reference herein to the Indenture and no provision of this Note or of the Indenture shall alter or impair the obligation of the Issuer, which is absolute and unconditional, to pay the principal of and any premium and interest on this Note at the times, place and rate, and in the coin or currency, herein prescribed.

As provided in the Indenture and subject to certain limitations therein set forth, the transfer of this Note is registrable in the Security Register, upon surrender of this Note for registration of transfer at the office or agency of the Issuer in any place where the principal of and any premium and interest on this Note are payable, duly endorsed by, or accompanied by a written instrument of transfer in form satisfactory to the Issuer and the Security Registrar duly executed by, the Holder hereof or his attorney duly authorized in writing, and thereupon one or more new Notes of like tenor, of authorized denominations and for the same aggregate principal amount, will be issued to the designated transferee or transferees.

The Notes are issuable only in registered form without coupons in denominations of $2,000 or any integral multiple of $1,000 in excess thereof. As provided in the Indenture and subject to certain limitations therein set forth, the Notes are exchangeable for a like aggregate principal amount of Notes of like tenor of a different authorized denomination, as requested by the Holder surrendering the same.

No service charge shall be made for any such registration of transfer or exchange, but the Issuer or the Trustee may require payment of a sum sufficient to cover any tax or other governmental charge payable in connection therewith.

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Prior to due presentment of this Note for registration of transfer, the Issuer, any Guarantor, the Trustee and any agent of the Issuer, any Guarantor or the Trustee may treat the Person in whose name this Note is registered as the owner hereof for all purposes (subject to Section 3.07 of the Original Indenture), whether or not this Note be overdue, and neither the Issuer, any Guarantor, the Trustee nor any such agent shall be affected by notice to the contrary.

All terms used in this Note that are not otherwise defined herein shall have the meaning assigned to them in the Indenture.

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SCHEDULE OF INCREASES OR DECREASES TO THE

GLOBAL NOTE

The following increases or decreases to this Global Note have been made:

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Exhibit 5.1

767 Fifth Avenue

New York, NY 10153-0119

+1 212 310 8000 tel

+1 212 310 8007 fax

May 29, 2020

Willis Towers Watson Public Limited Company

51 Lime Street

London EC3M 7DQ, England

Ladies and Gentlemen:

We have acted as counsel to Willis North America Inc., a Delaware corporation (the “Issuer”) and Willis Towers Watson Public Limited Company (the “Company”), a company incorporated under the laws of Ireland having company number 475616, Willis Towers Watson Sub Holdings Unlimited Company, a company with limited liability organized under the laws of Ireland, Willis Netherlands Holdings B.V., a company organized under the laws of the Netherlands, Willis Investment UK Holdings Limited, a company with limited liability organized under the laws of England and Wales, TA I Limited, a company with limited liability organized under the laws of England and Wales, Willis Towers Watson UK Holdings Limited, a company with limited liability organized under the laws of England and Wales, Trinity Acquisition plc, a company with limited liability organized under the laws of England and Wales, and Willis Group Limited, a company with limited liability organized under the laws of England and Wales (collectively, the “Guarantors”), in connection with the offer and sale by the Issuer of $275,000,000 aggregate principal amount of its 2.950% Senior Notes due 2029 (the “Notes”), fully and unconditionally guaranteed by the Guarantors (the “Guarantees” and, together with the Notes, the “Securities”), pursuant to an underwriting agreement, dated May 21, 2020, among the Issuer, the Guarantors and BofA Securities, Inc. and HSBC Securities (USA) Inc., as representatives of the underwriters named therein.

In so acting, we have examined originals or copies (certified or otherwise identified to our satisfaction) of (i) the Registration Statement on Form S-3 (File No. 333-230192), filed by the Company on March 11, 2019 (the “Registration Statement”), (ii) the prospectus, dated as of March 11, 2019 (the “Base Prospectus”), which forms a part of the Registration Statement, (iii) the preliminary prospectus supplement, dated May 21, 2020, (iv) the prospectus supplement, dated May 21, 2020 (the “Prospectus Supplement”), (v) the base indenture (the “Base Indenture”), dated as of May 16, 2017, among the Issuer, the guarantors party thereto and Wells Fargo, National Association, as trustee (the “Trustee”), as supplemented by a second supplemental indenture (the “Second Supplemental Indenture”), dated as of August 11, 2017, and a fourth supplemental indenture, dated as of September 10, 2019 (the “Fourth Supplemental Indenture”), (vi) the Officers’ Certificate pursuant to the Indenture, dated the date hereof (the “Officers’ Certificate” and, together with the Base Indenture, the Second Supplemental Indenture and the Fourth Supplemental Indenture, the “Indenture”) and (vii) such corporate records, agreements, documents and other instruments, and such certificates or comparable documents of public officials and of officers and representatives of the Issuer and the Guarantors, and have made such inquiries of such officers and representatives, as we have deemed relevant and necessary as a basis for the opinions hereinafter set forth.

In such examination, we have assumed the genuineness of all signatures, the legal capacity of all natural persons, the authenticity of all documents submitted to us as originals, the conformity to original documents of all documents submitted to us as certified, conformed or photostatic copies and the authenticity of the originals of such latter documents. As to all questions of fact material to this opinion that have not been independently established, we have relied upon certificates or comparable documents of officers and representatives of the Issuer and the Guarantors. We have also assumed (i) the valid existence of each of the Guarantors, (ii) that each of the Guarantors has the requisite corporate power and authority to enter into and perform the Securities, and (iii) the due authorization, execution and delivery of the Securities by each of the Guarantors, as applicable.

Based on the foregoing, and subject to the qualifications stated herein, we are of the opinion that:

The opinions expressed herein are limited to the laws of the State of New York and the corporate laws of the State of Delaware, and we express no opinion as to the effect on the matters covered by this letter of the laws of any other jurisdiction.

We hereby consent to the incorporation by reference of this letter as an exhibit to the Registration Statement and to the reference to our firm under the caption “Legal Opinions” in the Base Prospectus. In giving such consent, we do not hereby admit that we are in the category of persons whose consent is required under Section 7 of the Securities Act of 1933, as amended, or the rules and regulations of the Securities and Exchange Commission.

Very truly yours,

/s/ Weil, Gotshal & Manges LLP

Exhibit 5.2

Willis Towers Watson PLC

Willis Towers Watson House

Elm Park

Merrion Road

Dublin 4

29 May 2020

Dear Sirs

Willis Towers Watson Public Limited Company (the “Company”) and Willis Towers Watson Sub Holdings Unlimited Company (the “Subsidiary”)

We have acted as your Irish counsel in connection with the offering by Willis North America Inc. (“Willis”) of an additional $275,000,000 aggregate principal amount of its 2.950% senior notes due 2029 (the “Notes”) pursuant to the registration statement on Form S-3 (Registration Number 333 – 230192) filed by the Company with the United States Securities and Exchange Commission (the “SEC”) on 11 March 2019 (the “Registration Statement”).

The Notes have been issued by Willis pursuant to the base indenture dated 16 May 2017 among (i) Willis, (ii) the Company, the Subsidiary and the other guarantors party thereto, and (iii) Wells Fargo, National Association (as trustee) (the “Base Indenture”), as supplemented, including by the fourth supplemental indenture dated 10 September 2019 (the “Supplemental Indenture”) and an officers’ certificate dated 29 May 2020, each among (i) Willis, (ii) the Company, the Subsidiary and the other guarantors party thereto, and (iii) Wells Fargo Bank, National Association (as trustee) (the “Officers’ Certificate”, and together with the Supplemental Indenture and the Base Indenture, the “Indenture”). The Indenture provides for the obligations under the Notes to be fully and unconditionally guaranteed (the “Guarantees”) pursuant to guarantees included in the Base Indenture by the Company, the Subsidiary, Willis Investment UK Holdings Limited, Willis Netherlands Holdings B.V., TA I Limited, Willis Towers Watson UK Holdings Limited, Willis Group Limited and Trinity Acquisition plc.

For the purposes of this opinion we have examined and relied upon the Registration Statement, the Officers’ Certificate and the documents listed in the Schedule to this opinion. The Registration Statement, the Officers’ Certificate and such documents are collectively referred to as the “Documents”. The Company and the Subsidiary are referred to as the “Irish Obligors” and each an “Irish Obligor”.

We have made no searches or enquiries concerning, and we have not examined any contracts, instruments or documents entered into by or affecting the Irish Obligors or any other person, or any corporate records of the aforesaid, save for those searches, enquiries, contracts, instruments, documents or corporate records specified as being made or examined in this opinion.

This opinion is delivered in connection with the offering of the Notes by Willis and is strictly limited to the matters stated herein and does not extend to, and is not to be read as extending by implication to, any other matter.

Assumptions

For the purposes of giving this opinion we have assumed:

2

Opinion

Based upon and subject to the foregoing and subject to the reservations set out below and to any matter not disclosed to us, we are of the opinion that:

3

Reservations

This opinion is subject to the following reservations:

4

Searches”). Online Searches may not be up to date and may not disclose a winding up order or a petition for the appointment of an examiner or the appointment of a receiver which has been filed with the Central Office of the High Court subsequent to the temporary closure of the Central Office of the High Court as referred to above.

Disclosure

This opinion is addressed to you in connection with the filing by the Irish Obligors and the other registrants named therein of the Registration Statement with the SEC. We consent to the incorporation by reference of this opinion as an exhibit to the Registration Statement and to the reference to our firm under the caption “Legal Opinions” in the Prospectus. In giving the foregoing consent, we do not thereby admit that we come within the category of persons whose consent is required under Section 7 of the Securities Act of 1933, as amended, of the United States, or the rules and regulations of the SEC. Except as stated above, without our prior written consent, this opinion may not be furnished or quoted to or relied upon by any person for any purpose.

Further, this opinion speaks as of its date and is strictly limited to the matters stated herein and we assume no obligation to review or update this opinion if applicable laws or the existing facts or circumstances should change.

This opinion is governed by and is to be construed in accordance with Irish law. It is given on the basis that it will not give rise to any legal proceedings with respect thereto in any jurisdiction other than Ireland.

Yours faithfully

/s/ MATHESON

5

SCHEDULE

6

1

Our role in respect of the entering into of the Documents (as defined below) by the Company has been limited to the issue of this opinion. We have not been involved in drafting or negotiating any documents or agreements cross-referred to in any of the Documents. Accordingly, we assume no responsibility for the adequacy of any Document.

For the purposes of this opinion, we have examined, and relied solely upon, originals or electronic copies of the documents as listed below, but not any documents or agreements cross-referred to in any such document (the “Documents”):

2

3

4

This assumption is supported by (i) certifications and confirmations to that effect in the Resolutions, (ii) confirmations obtained as of the date hereof from (a) the Bankruptcy Clerk Office (faillissementsgriffie) of the competent courts of The Netherlands (b) the EU Insolvency Register (EU Insolventieregister) and (c) the online central insolvency register (Centraal Insolventie Register) confirming that the Company has not been declared bankrupt, that a moratorium of payments has not been granted and (iii) the confirmation obtained by telephone today from the Chamber of Commerce that the Company has not been declared bankrupt or dissolved nor a moratorium of payments has been granted, that no administrator (bewindvoerder) has been appointed, and that the Chamber of Commerce does not intend to dissolve the Company;

5

6

We have not investigated or verified and we do not express an opinion on the accuracy of the facts, representations and warranties as to facts set out in the Documents, and in any other document on which we have relied in giving this opinion and for the purpose of this opinion, we have assumed that such facts are correct.

We do not express an opinion on matters of fact, matters of law of any jurisdiction other than The Netherlands, nor on tax, anti-trust law, insider dealing, data protection, unfair trade practices, market abuse laws, sanctions or international law, including, without limitation, the laws of the European Union, except to the extent the laws of the European Union (other than anti-trust and tax law) have direct force and effect in The Netherlands. No opinion is given on commercial, accounting, tax or non-legal matters or on the ability of the parties to meet their financial or other obligations under the Documents.

Based on and subject to the foregoing (including the assumptions made above) and subject to any matters, documents or events not disclosed to us by the parties concerned and having regard to such legal considerations as we deem relevant, and subject to the qualifications listed below, we are of the opinion that:

Corporate Status

Capacity

Authorisation

7

Execution

According to the Company Excerpt, the board of managing directors of the Company consists of Adriaan Cornelis Konijnendijk (managing director A), Zie Ar Sing-Jegat (managing director A), Caroline Sarah Mc Carthy (managing director A), Sandra Marie Sierakowski (managing director B), Rosemary Hazel Hammond-West (managing director B) (jointly referred to as the “Board Members”).

Since the Board Resolution, which contains the Power of Attorney, is expressed to have been executed by the Board Members, the Power of Attorney has been validly granted on behalf of the Company.

Thus, the execution of the Officers’ Certificate on behalf of the Company by means of the signatures of a managing director A and a managing director B constitutes a due execution of the Officers’ Certificate on behalf of the Company.

The opinions expressed above are subject to the following qualifications:

8

Powers of attorney, which are expressed to be irrevocable, are not capable of being revoked and (unless the power of attorney provides otherwise) will not terminate upon the death of or the commencement of legal guardianship of the Principal insofar as they extend to the performance of legal acts (rechtshandelingen) which are in the interest of the Appointed Attorney or a third party. However, at the request of the Principal, an heir or a trustee of such person, the court may amend or cancel an irrevocable power of attorney for significant reasons (gewichtige redenen).

In the event the Principal is granted a moratorium of payments (surseance van betaling), a power of attorney can only be exercised with the cooperation of the court-appointed administrator (bewindvoerder).

9

In practice, the concept of ultra vires has rarely been applied in court decisions in The Netherlands. Only under exceptional circumstances have transactions been considered to be ultra vires and consequently have been annulled. Nullification of a transaction can result in (internal) liability of the managing directors toward the legal entity.

The issuing of the guarantees is reflected in paragraph d. of article 3 of the objects clause (doelomschrijving) of the Articles of Association. However, the management of the Company must consider whether the issuing of the guarantees actually fulfils the material interests of the Company.

VII Confidentiality and Reliance

In issuing this opinion we do not assume any obligation to notify or to inform you of any developments subsequent to its date that might render its contents untrue or inaccurate in whole or in part at such time. This opinion letter:

10

The foregoing opinions are limited in all respects to and are to be construed and interpreted in accordance with the laws of The Netherlands as they stand at today’s date and as they are presently interpreted under published authoritative case law as at present in effect.

This opinion is addressed to you and may only be relied upon by you in connection with the filing of the Registration Statement and the transactions to which the Indenture relates. This letter may not be supplied, and its contents or existence may not be disclosed, to any person other than as an exhibit to (and therefore together with) the Registration Statement and may not be relied upon for any purpose other than the registration and the transactions to which the Indenture relates.

We consent to the incorporation by reference of this opinion as an exhibit to the Registration Statement and to the reference to our firm under the caption “Legal Opinions” in the Prospectus Supplement. In giving such consent, we do not thereby admit that we are within the category of persons whose consent is required under Section 7 of the U.S. Securities Act of 1933 or the rules and regulations of the SEC thereunder. In giving this consent, we do not imply that we are experts under the U.S. Securities Act of 1933, as amended or the rules and registrations of the SEC issued thereunder with respect to any part of the Registration Statement, including this letter.

11

This opinion is given on behalf of Baker & McKenzie Amsterdam N.V. and not by or on behalf of Baker & McKenzie International (a Swiss Verein) or any other member thereof. In this opinion the expressions “we”, “us”, “our” and like expressions should be construed accordingly. Any liability of Baker & McKenzie Amsterdam N.V. pursuant to this opinion shall be limited to the amount covered by its liability insurance.

Yours sincerely,

/s/ Baker & McKenzie Amsterdam N.V.

12

Exhibit 5.4

110 Fetter Lane

London EC4A 1AY

+44 20 7903 1000 tel

+44 20 7903 0990 fax

51 Lime Street

London

EC3M 7DQ

England

29 May 2020

Dear Ladies and Gentlemen

Willis North America Inc. (the “Issuer”): additional $275,000,000 aggregate principal amount of its 2.950% Senior Notes due 2029 (the “Securities”)

Weil, Gotshal & Manges (London) LLP (“Weil London”) is a limited liability partnership incorporated in England and Wales under number OC400678. Its registered office is at 110 Fetter Lane, London EC4A 1AY. Weil London is authorised and regulated by the Solicitors Regulation Authority under SRA ID 623206. A list of the members of Weil London is available at the registered office. We use the word “partner” to refer to a member of Weil London or an employee or consultant with equivalent standing and qualifications.

Page 2

In order to give this opinion we have only examined the Indenture (including the English Guarantees), and the documents and certificates listed in the schedule to this letter (together the “Documents”). We have relied upon the statements as to factual matters contained in each of the Documents. We express no opinion as to any agreement, instrument or other document other than as specified in this letter. In addition, we have not been instructed to make any enquiries concerning any of the parties to the Indenture (other than in respect of the English Companies) for the purposes of this opinion nor have we done so.

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The opinions expressed herein are rendered solely for your benefit in connection with the transactions described herein. Those opinions may not be used or relied upon by any other person, nor may this letter or any copies hereof be furnished to a third party, filed with a governmental agency, quoted, cited or otherwise referred to without our prior written consent. Notwithstanding the foregoing, we hereby consent to the incorporation by reference of this letter as an exhibit to the shelf registration statement filed with the U.S. Securities and Exchange Commission (the “Commission”) dated 11 March 2019 (the “Registration Statement”), and to any and all references to our firm in the Prospectus. In giving such consent we do not hereby admit that we are in the category of persons whose consent is required under Section 7 of the U.S. Securities Act of 1933, as amended, or the rules and regulations of the Commission.

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SCHEDULE