Aspen Set to Develop London-Based Aviation Account to Further Expand London Market Insurance Portfolio HAMILTON, Bermuda, September 3 /PRNewswire-FirstCall/ -- Aspen Insurance Holdings Limited (NYSE:AHL)(BSX:AHLBSX:BH) ("Aspen") today announces its intention that Aspen Insurance UK Limited, a wholly owned subsidiary, is to further expand its London market insurance portfolio by recruiting a new team to develop an aviation insurance account from 2005. Aspen continues to develop a more balanced insurance / reinsurance portfolio with a high quality earnings stream by expanding its insurance underwriting. Under the leadership of Nick Bonnar, who is responsible for Aspen's London Market Specialty lines, Aspen's aviation team will join the recently recruited marine underwriting team, headed by liability specialist John Henderson. Chief Executive, Chris O'Kane said: "The move into aviation insurance is part of our strategy to grow our insurance business in complex technical lines and help balance our overall portfolio. Because of its excellent broker distribution network and strong infrastructure, London is the global center for large-risk aviation insurance. We are recruiting a team with a strong underwriting track record and a reputation for excellent levels of service that will match Aspen's philosophy." About Aspen Insurance Holdings Limited Aspen Insurance Holdings Limited (Aspen) was established in June 2002. Aspen is a Bermudian holding company that provides property and casualty reinsurance in the global market, property and liability insurance principally in the United Kingdom and surplus lines insurance in the United States. Aspen's operations are conducted through its wholly-owned subsidiaries located in London, Bermuda and the United States: Aspen Insurance UK Limited (trading as Aspen Insurance and Aspen Re), Aspen Insurance Limited (Aspen) and Aspen Specialty Insurance Company (Aspen Specialty). Aspen's reinsurance segment consists of property reinsurance, casualty reinsurance and specialty reinsurance lines of business. Aspen's insurance segment consists of commercial property insurance and commercial liability insurance lines of business. Aspen's principal existing shareholders include The Blackstone Group, Candover Partners Limited, Credit Suisse First Boston Private Equity and Wellington Underwriting plc. This press release contains, and Aspen may from time to time make, written or oral 'forward-looking statements' within the meaning of the US federal securities laws. All forward-looking statements rely on a number of assumptions concerning future events and are subject to a number of uncertainties and other factors, many of which are outside of Aspen's control that could cause actual results to differ materially from such statements. For a detailed description of these uncertainties and other factors that could cause the actual results to differ, please see the 'Risk Factors' section in Aspen's Registration Statement on Form F-1 with respect to the ordinary shares, filed with the US Securities and Exchange Commission. DATASOURCE: Aspen Insurance Holdings Limited CONTACT: UK Contacts: The Maitland Consultancy, Emma Burdett, Brian Hudspith, T +44-20-7379-5151; US Contacts: The Abernathy MacGregor Group, Carina Thate, Jason Thompson, T +1-212-371-5999; Investor Contact: Aspen Insurance Holdings Limited, Noah Fields, Head of Investor Relations, Julian Cusack, Chief Financial Officer, T +441-295-8201

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