Gill is 53, and has two older children (Flora, 16, and Alistair, 14) by his second wife Amber Rudd, a venture capitalist. His first was the writer Cressida Connolly, whom he married in his twenties. I ask him how old Formby is - his third long-term partner - and he says, completely unbelievably, that he doesn't know. "I honestly don't." That sounds coy. You've been living with her for years: have you never looked in her passport? "I'm so dyslexic with numbers, even if I did, I couldn't work it out." He is profoundly dyslexic - he has to file copy over the phone since editors can't read his written version - but, come on, enough of the faux-gallantry. I think she's 41, anyway.