Watching an adaptation of your novel can be a violent experience: seeing your old jokes suddenly thrust at you can be alarming. But I started to enjoy Money very quickly, and then I relaxed.

It's a voice novel, and they're the hardest to film you've got to use some voiceover to get the voice. But I think the BBC adaptation was really pretty close to my voice just the feel of it, the slightly hysterical feel of it, which I like. It's a pity one line wasn't used. Speculating about whether Charles slept with Diana, in the book the barman says, "He's the heir to the frone. I mean, he's got to know what he's getting, hasn't he?" I was waiting for it and it didn't come. But that's just a tiny lost opportunity. You sort of let it go and think it's not going to be the book, it's someone else's idea of the book, the basic difference being that a novel is about interior life and a film about exterior life, and you accept that.