When Rudolf Hess, Hitler’s deputy, ejected from the aeroplane he was flying solo to Scotland, he parachuted to the ground and, injured, was taken to the local police station. This was 1941 and he had come on a doomed mission to draw the United Kingdom into peace negotiations. Hess’s aim was to deliver his proposals to the 14th Duke of Hamilton, another keen aviator and the first man to fly over Mount Everest, whom he fancifully supposed might be sympathetic.