We have to concentrate back on: Where is the money going? Where's it been going for the last thirty years? How do we start to redistribute the cake more evenly, and give people opportunities? That's as much about poor white people in West Virginia as it is about poor black people on the Southside of Chicago.

It's all been quite a revitalizing process for me, being out there in the States. It wouldn't have happened without Trainspotting.

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.

That's all very well as an abstract moral principle, Avril, a coffee-table theoretical construct, but there's no denying the sheer gratuitous pleasure to be derived from seeing members of the ruling class in pain and torment.

Are you asking me or telling me?

In some ways, you can say that at any time in any writer's career: 'He might have run out of ideas.'

There is a kind of mysticism to writing.