Martin is your best friend, isn't he?' a sweet and well-intentioned girl once said when both of us were present: it was the only time I ever felt awkward about this precious idea, which seemed somehow to risk diminishment if it were uttered aloud.

On page 605, Blumenthal says that 'I made friends with Hitchens's friends the novelists Martin Amis and Salman Rushdie.' True in its way. I particularly remember the occasion when he called me up and invited me to dinner with Dick Morris, but only on condition that I brought Rushdie (who was staying in my house) along with me. No Rushdie: no invitation. So I never did get to meet Dick Morris.

I don't know why I wanted a girl,' he says, as if to himself. 'I mean, I wouldn't swap Louis, but when they said, 'It's a boy!', I thought: 'Oh, well.' Everyone else was incredibly pleased that it was a boy – grandparents are always very pleased when it's a boy for some reason. Another one's on the way, and I hope it's going to be a girl. After that, I'll stop. I think it can be a real mistake to sort of plug away for a particular sex … you end up having millions and they're all boys.

I think novelists are in the education business, really, but they're not teaching you times tables, they are teaching you responsiveness and morality and to make nuanced judgments. And really to just make the planet look a bit richer when you go out into the street.