Item 7.01 Regulation FD Disclosure.

On October 9, 2008, Aon Corporation ("Aon") began making open market purchases on behalf of its wholly-owned subsidiary Aon Benfield Holdings Limited ("ABHL") of common shares of Benfield Group Limited ("Benfield"), a Bermuda company whose common shares ("Shares") are listed on the London Stock Exchange (the "Exchange"). As of the close of the Exchange on October 9, 2008, ABHL, the beneficial owner of these Shares, had acquired through Aon's purchases 1,500,000 Shares. ABHL anticipates that it may continue making additional purchases in this manner until the closing of Aon's acquisition of Benfield, as previously disclosed in Aon's Form 8-K filed with the Securities and Exchange Commission on August 22, 2008 ("August Form 8-K"); however, there is no guarantee of the number of Shares, if any, that will be purchased in any subsequent purchases by Aon on behalf of ABHL. Aon undertakes no obligation to update, supplement or amend this Form 8-K upon any subsequent purchases of Shares or upon any future decisions to refrain from such purchases.

As previously announced in Aon's August Form 8-K, Aon has signed a definitive agreement with Benfield (the "Implementation Agreement") pursuant to which Aon will acquire all of the share capital of Benfield (the "Acquisition"), subject to Benfield shareholder approval and other closing conditions. The Acquisition will be effected by a newly-formed, wholly-owned Bermuda subsidiary of Aon through an amalgamation under the Bermuda Companies Act. This summary of the Acquisition is qualified in its entirety by reference to the description thereof included in the August Form 8-K, including Aon and Benfield's related announcement and the Implementation Agreement, copies of which were attached thereto as Exhibits 2.1 and 2.2, respectively.

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