LONDON, 7 September 2005 - Aon Risk Services - a division of Aon Limited, a leading insurance broker and risk management consultant - has appointed Kelly Sinclair as Development Executive to strengthen the charity sector team’s drive for new business and build upon existing expertise.

Miss Sinclair will be responsible for working with charities to understand risk requirements and implement robust insurance programmes and risk solutions.

Previously with Marsh, Miss Sinclair brings to the role an extensive knowledge of the charity sector and experience working with major UK organisations.

Commenting on the appointment, Rosemary Gilmour, Director of Client Management and Sales for Aon Risk Services, said: “Kelly will be an asset to the team with her excellent industry contacts and knowledge of risk management best practice for charities.  She will benefit our clients by bringing fresh ideas and solutions to risk issues.”

Notes to Editors:

About Aon

Aon Corporation (www.aon.com) is a leading provider of risk management services, insurance and reinsurance brokerage, human capital and management consulting, and specialty insurance underwriting. The company employs approximately 48,000 professionals in its 500 offices in more than 120 countries.  Backed by broad resources, industry knowledge and technical expertise, Aon professionals help a wide range of clients develop effective risk management and workforce productivity solutions.

This press release contains certain statements relating to future results, which are forward-looking statements as that term is defined in the Private Securities Litigation Reform Act of 1995.  These forward-looking statements are subject to certain risks and uncertainties that could cause actual results to differ materially from either historical or anticipated results, depending on a variety of factors.  Potential factors that could impact results include the general economic conditions in different countries around the world, fluctuations in global equity and fixed income markets, exchange rates, rating agency actions, resolution of pending regulatory investigations and related issues, including those related to compensation arrangements with underwriters, pension funding, ultimate paid claims may be different from actuarial estimates and actuarial estimates may change over time, changes in commercial property and casualty markets and commercial premium rates, the competitive environment, the actual costs of resolution of contingent liabilities and other loss contingencies, and the heightened level of potential errors and omissions liability arising from placements of complex policies and sophisticated reinsurance arrangements in an insurance market in which insurer reserves are under pressure.  Further information concerning the Company and its business, including factors that potentially could materially affect the Company’s financial results, is contained in the Company’s filings with the Securities and Exchange Commission.