We were looking for someone who could get the film [Filth] made at that kind of level, with the finance we wanted, and we spoke to a lot of people. When I met James [McAvoy] in the Soho Hotel with Jon Baird, the director, he looked about ten years old. I thought there's no way he's going to be a forty-year-old divorced alcoholic cop. I thought, really lovely guy, I'll let him and John talk and see if they get on.

I'm quite comfortable now with being misunderstood. I don't really feel the need either to pander to it or to refute it. Just go on, and do what I've got to do.

When you're in your twenties, it's the last time you have the chance to experiment with multiple identities, to decide who you're going to be in life.

I was in Athens for a football match when 9/11 went down, and it was quite spectacular - we went into this bar and tried to find out what happened, and the bartender said "it's only the American and the Arabs. They're not big football nations." So the feeling was, what's it got to do with us? Why are football games being cancelled in Europe? The intelligentsia in the West feel like they have to figure out the significance of it all, whereas people have other pressing concerns, related to basic needs.

When you look at the whole explosion of the Internet, the decline of print journalism, there are all of these plus-or-minus ramifications, and you have to work it out. The great thing about books is that you have a tactile thing that's there. You can download this or download that, but how long do you want to be staring at a screen for the rest of your life? You've got to have some kind of proper interface for people that's not about the screen.

I'm not interested in details that might get someone into trouble. I'm more interested in generalities rather than the particulars, as a journalist would be. Names, dates and times don't interest me at all. I'm interested in feelings and emotions. Most people are game, once they realize that you're on the level as far as that's concerned and you're not about exposing them, then they feel quite free to talk about it. Police officers and social workers are no exception.

The readers get younger all the time, and we're getting older.