A book like this would be impossible to produce without the help of many individuals and organisations, and the publishers are grateful to everyone who contributed to the success of this project. We would like to thank all who helped by granting interviews and giving permission to use personal memoirs and quotes. Special thanks are due to: David Bickers and the Douglas Bader Foundation; Air Chief Marshal Sir Christopher Foxley-Norris, GCB, DSO, OBE, and Wing Commander N. P. W. Hancock, DFC, of the Battle of Britain Fighter Association; Air Vice-Marshal A. V. R. (Sandy) Johnstone, CB, DFC, AE, DL; Andrew Cormack and the staff of the RAF Museum at Hendon; Lt. Col. Dr. Dieter Rogge, Oberlieutnant Peter-Jorg Wiesener, Regierungs-oberinspektor Hartmann and the staff of the Luftwaffenmuseum in Hamburg; Andy Saunders and the Tangmere Military Aviation Museum Trust; Tony Gilberts and the 39/45 Warbirds Club; the late Paul Smith; and the RAF Air Historical Branch.