13D Filing: VA Partners I, LLC and Willis Towers Watson PLC (WLTW)

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SCHEDULE 13D
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CUSIP NO. G96629103 Page 11 of 11
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Exhibit 1

JOINT FILING UNDERTAKING

The undersigned parties hereby agree that the Schedule 13D filed herewith
(and any amendments thereto) relating to the Common Stock of Willis Towers
Watson Public Limited Company, is being filed jointly on behalf of each of
them with the Securities and Exchange Commission pursuant to Section 13(d) of
the Securities Exchange Act of 1934, as amended.

ValueAct Capital Master Fund L.P., by
VA Partners I, LLC, its General Partner

By: /s/ Bradley E. Singer
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Dated: May 30, 2017 Bradley E. Singer, Chief Operating Officer

VA Partners I, LLC

By: /s/ Bradley E. Singer
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Dated: May 30, 2017 Bradley E. Singer, Chief Operating Officer

ValueAct Capital Management, L.P., by
ValueAct Capital Management, LLC its
General Partner

By: /s/ Bradley E. Singer
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Dated: May 30, 2017 Bradley E. Singer, Chief Operating Officer

ValueAct Capital Management, LLC

By: /s/ Bradley E. Singer
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Dated: May 30, 2017 Bradley E. Singer, Chief Operating Officer

ValueAct Holdings, L.P., by
ValueAct Holdings GP, LLC, its
General Partner

By: /s/ Bradley E. Singer
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Dated: May 30, 2017 Bradley E. Singer, Chief Operating Officer

ValueAct Holdings GP, LLC

By: /s/ Bradley E. Singer
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Dated: May 30, 2017 Bradley E. Singer, Chief Operating Officer

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