It was one of the most bizarre episodes of the Second World War. When Hitler’s deputy, Rudolf Hess, landed by parachute in 1941 near the estate of the Duke of Hamilton in Lanarkshire, it raised the question of whether British intelligence or members of the aristocracy were trying to broker a secret peace deal with the Nazis. But recently declassified MI5 files shed more light on Hess’s mysterious flight to Scotland, and finally prove the conspiracy theories to be unfounded, according to the duke’s son, Lord James Douglas-Hamilton, the Lothians MSP. The Conservative peer said yesterday that the new MI5...