In 1941, the deputy fuhrer, Rudolf Hess, flew out of Nazi Germany and landed in Scotland.

Keen to study the psychology of the Nazi leadership, the British government sent a psychiatrist called Henry Dicks to examine Hess at a safe house in Surrey.

Professor Daniel Pick, author of "The Pursuit of the Nazi Mind", retraces the encounter using BBC archive recordings and Dr Dicks' personal papers.

The programme is adapted from "The Psychiatrist and the Deputy Fuhrer", first broadcast on BBC Radio 4.

(Photo: Rudolf Hess, German politician and wartime deputy of Adolf Hitler, during a public speech in 1937)