Special limited edition cover to commemorate the 80th Anniversary of the Royal Air Force. Each cover has been personally signed by two highly distinguished RAF aircrew veterans from World War Two. Air Chief Marshall Sir John Aiken KCB (flew Spitfires in World War Two with 611 and 548 Squadrons) Group Captain Desmond Sheen DFC* (flew Spitfires with 72 Squadron during the Battle of Britain)