I must declare my connection to Louis Theroux. I was in the year below him at school and university. He hasn’t changed very much. He was just as gentle then – dopey even – as he was on the telly in Weird Weekends, when he investigated the strange American sects he writes up in this book. What is less apparent on telly is his acute intelligence, telegenically veiled by that dopiness. He was so clever at Westminster that he jumped a year. And he got a First in Modern History at Magdalen.