Form of notice of extension of $400,000,000 Five-Year Credit Agreement among Aon plc, Aon Corporation, as borrowers, the lenders party thereto, Citibank, N.A., as administrative agent, and HSBC Bank (USA), National Association, as syndication agents, entered into as of October 19, 2017

__________, 2019

Citibank, N.A., as Administrative

Agent for the Lenders party

to the Credit Agreement

referred to below

Building #3

1615 Brett Rd.

New Castle, Delaware 19720

Attention: Bank Loan Syndications

Ladies and Gentlemen:

Reference is made to the Five Year Credit Agreement dated as of October 19, 2017 (as amended or modified from time to time, the "Credit Agreement") among Aon plc, Aon Corporation, as borrowers, the Lenders (as defined in the Credit Agreement) and Citibank, N.A., as administrative agent for the Lenders (the "Administrative Agent"). Terms defined in the Credit Agreement are used herein with the same meaning unless otherwise defined herein, and all references to Sections herein are references to Sections of the Credit Agreement.

Pursuant to Section 2.22(b), the Lender named below hereby notifies the Administrative Agent as follows:

The Lender named below desires to extend the Facility Termination Date with respect to its Commitment for a period of one year, expiring October 19, 2023.

This notice and is subject in all respects to the terms of the Credit Agreement, is irrevocable and shall be effective only if received by the Administrative Agent no later than September 27, 2019.

Very truly yours,

[NAME OF LENDER]

By:                    

Name:

Title: