It's like going back to school. You know, autumn! Time for 'Harry Potter'.

I went to Glenalmond and got the piss taken out of me for my Glasgow accent. Then I spent five years at this very posh school, came out sounding like Prince Charles, which you have to do in order to survive, and then I got called Lord Fauntleroy for the first six months at art school.

Usually for a movie, if you want a 13-year-old, you get a 16-year-old who looks 13, because 13-year-olds dont have that level of self-awareness.

I had a very bad time with acid. I did that classic thing of looking in the mirror by mistake and seeing the devil. But I took it several times, because you always think that next time you might have the wonderful time that everyone else is having.

That's the trouble with anything which essentially has a lot of bits that are physically impossible: You're left, stuck, in the studio. And that's a shame. You're making a movie. You don't want it to stay put, you want it to be a movie - to move.

I knew it was going to be enormous because of the number of people who bought the books, but, to be honest, I never thought it would be bigger than Bond. Never in a million years.

Once you've been doing anything for twenty-five years people start to notice you.