This delightfully eccentric memoir begins with one of the most arresting opening sentences I have read in a long time. ‘It was in my first year at Oxford’, Robert Irwin writes, ‘that I decided that I wanted to become a Muslim saint.’ It’s an uncommon ambition, particularly for someone raised as an Anglican, a former pupil of Epsom College and the son of the superintendent of the Holloway Sanitarium. But Irwin, by his own admission, was always a bit of a strange case.

A keen reader of science fiction as an adolescent, socially isolated and, in Philip K Dick’s phrase, ‘a drug-taking paranoiac with religious obsessions’, he ‘dreamed of growing up as a messiah with superpowers’.