Willis Towers Watson Public Limited (WTW) 8-K Changes in Registrant's Certifying Accountant

Exhibit 16.1

March 3, 2017

Securities and Exchange Commission

100 F Street, N.E.

Washington, D.C. 20549-7561

Dear Sirs/Madams:

We have read Item 4.01 of Willis Towers Watson Public Limited Company’s Form 8-K dated March 3, 2017, and have the following comments:

1) We agree with the statements made in the first, second and third paragraphs.

Yours truly,

/s/ Deloitte LLP

London, United Kingdom