These 16 groups of letters and e-mails, involving a total of 28 people, relate to the research for the booklet The Pegasus Story: a history of a vintage British computer by Simon Lavington, published by the Science Museum in 2000 (ISBN 1 900747 40 5). Unless otherwise indicated, the correspondents all had some connection with Pegasus, either as former Ferranti employees or as end-users. The correspondence was part of an exercise between about March 1999 and July 2000 to gather facts and anecdotes and subsequently to check the text of the booklet. In some cases there were related telephone conversations but few notes of these survive.