My chief debt of gratitude is to my husband Keith, and to Michael Smith and Ralph Erskine, who encouraged me to write this book, giving due credit to Dilly as an outstanding cryptographer, and for their assistance throughout. I should also like to thank John Gallehawk, Frank Carter and Brian Oakley for their help. Rosamund Twinn kindly supplied the photograph of Peter Twinn, Eugenia Maresch that of Rejewski, Pam Brewster that of John Jeffreys and Kathleen Warren that of Admiral Godfrey. Pam Smith, the Naphill local historian, was most helpful in supplying information and photographs of Dilly’s woodlands. The Bletchley Park Trust has been generous with archives and photographs and I am very grateful to Kelsey Griffin for all her help. Frank Carter and Ralph Erskine’s appendices are valuable additions to the book which show the extent and originality of Dilly’s contribution to wartime cryptography. It has been a great pleasure for me to work with Michael Smith as editor and to be the author of the first book to be published by Dialogue.
Mavis Batey
July 2009