The only voice recording Sigmund Freud ever made was for the BBC. It was made in December 1938, at Freud’s West Hampstead home just a few months before the father of psychoanalysis succumbed to throat cancer. He was 82 and wouldn’t see out another year, yet here he was on fighting form: “People did not believe in my facts and thought my theories unsavoury,” he declaims, his voice clipped, precise and resoundingly emphatic. “Resistance was strong and unrelenting. The struggle is not yet over."