I wanted to do London Boulevard because I saw the potential of a story about two people who need each other desperately, who love at first sight, as one does, and above all a story in which no one is what they appear to be.

Actors are players and if they're hot, or onto something, you let them go, or you and the actor can both get on to something. I always run out with lines as I think of them.

Doing crime films...maybe it's to some extent a matter of taste. Certainly my first novel had a criminal element and was about the similarity of criminals and artists. Pretextually, it was sort of a money bag thriller. But it was aggressively not what it seemed to be. It was kind of Duchamps.

It's been very much in the blood since I started imagining films or shooting with 8mm when I was a kid. I made some films and thought about films, but then I went into writing. Becket is something that's definitely on the cards. We have to see where that fits in the schedule, because it's a big picture and I have a lot of writing obligations at the moment. I'm wary of anything with a budget over a certain amount.

Dialogue is used to reveal not what we want to say, but what we are trying to hide.

The thing about The Departed, the x-factor that people can't quite put their finger on, is that it deals clearly with class and accent all these things that are fundamental to Boston, but previously anomalous or even prohibited in demotic American films.

I'm more from a double world where I wasn't part of anything or invested in anything, because I was Irish, and very Irish, but also the other part of my family, not that it had airs, or money, was descended from the first minister on Cape Ann in the 1620s.