Dr Alfred Price served as an aircrew officer in the RAF until 1974. Since then he has been a full-time aviation historian and writer, and is acknowledged as a leading authority on the Spitfire. He is co-author of the Haynes Spitfire Manual. Paul Blackah joined the RAF in 1976 and trained as an airframe fitter. In 1993 he was posted to the Battle of Britain Memorial Flight. His specialized knowledge of vintage aircraft is considered crucial to the maintenance of the aircraft in the flight. In the 1990s Paul was closely involved in the restoration-to-flight of the Messerschmitt Bf109F 'Black 6'. He is co-author with Alfred Price of the Supermarine Spitfire Manual. He lives in Lincolnshire, England.