I tend to read non-fiction.

It's always hard when you're playing someone for a lot of people out there who are going to see the movie after reading the books. There's a communion between a reader and the writer, so people will have an idea who Sirius Black is and I might not be everyone's idea of that.

Impressionists have to paint with a very broad stroke because you've got to see it within a couple of seconds. You go, "That's a really funny Robert De Niro." As an actor, though, you look at different aspects of a character. I try to completely surround myself with the assignment. It's like being in a big cloud and then some of it rains through.

I don't go to premieres. I don't go to parties. I don't covet the Oscar. I don't want any of that. I don't go out. I just have dinner at home every night with my kids. Being famous, that's a whole other career. And I haven't got any energy for it.

The great thing about Google is that you type in neuro-surgery and somehow you end up with Peter Sellers or watching Frank Sinatra. Google is a great resource.

Rather like Batman, I embody the themes of the movie which are the values of family, courage and compassion and a sense of right and wrong, good and bad and justice.

The thing a drama school can't give you is instinct. It can sharpen instinct but that can't be taught, and you have to have intuition. It's an essential ingredient.