Exhibit 99.1 [NATIONAL INDEMNITY COMPANY LETTERHEAD] November 1, 2002 Mr. Michael Watson Trenwick Managing Agents Limited No. 2 Minster Court Mincing Lane London EC3R 7FL England Re: Agreement between National Indemnity Company and Trenwick Managing...Trenwick Group LTD • November 5th, 2002 • Fire, marine & casualty insurance
