When Lady Ann Sercomb married George Smiley towards the end of the war she described him to her astonished Mayfair friends as breathtakingly ordinary. When she left him two years later in favour of a Cuban motor racing driver, she announced enigmatically that if she hadn’t left him then, she never could have done; and Viscount Sawley made a special journey to his club to observe that the cat was out of the bag.

This remark, which enjoyed a brief season as a mot, can only be understood by those who knew Smiley. Short, fat, and of a quiet disposition, he appeared to spend a lot of money on really bad clothes, which hung about his squat frame like skin on a shrunken toad. Sawley, in fact, declared at the wedding that ‘Sercomb was mated to a bullfrog in a sou’wester’. And Smiley, unaware of this description, had waddled down the aisle in search of the kiss that would turn him into a Prince.