Whether a belief is considered to be a delusion or not depends partly upon the intensity with which it is defended, and partly upon the numbers of people subscribing to it.

Oxford
In 1974 Storr moved from private practice to a teaching appointment at the Warneford Hospital in Oxford until his retirement in 1984. He qualified as a doctor in 1944 and subsequently specialized in psychiatry. He was educated at Winchester College Christ's College (University of Cambridge) and Westminster Hospital.