That there’s a direct correlation between sex and spying is probably Ian Fleming’s fault. Hard to think of Bond without thinking about his women. For Charlotte Bingham, though, the connection occurred at a deeper level. When her father, John — legendary spook, long believed to be the model for George Smiley — called her into his study to reveal that he worked for MI5, she was terrified that he was about to explain the facts of life, many of which had already been revealed to her by a friend on Bognor beach: ‘I thought I was going to pass out...