People imagine that actors are being offered everything and you are not. So things come in and sometimes there are things that I want and can't get a meeting on, or go to a different actors.

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.

Wanting to be a good actor is not good enough. You must want to be a great actor. You just have to have that.

If one could have a wish, or an alternative life, I would've liked to have been John Lennon.

And of course I've got kids of my own now, and they love me being in the Harry Potter films. I'm now part of a phenomenon. You become incredibly cool to your kids, and you get a young fan base. So you became the cool dad at school. You're suddenly hip.

How do you remember all those lines? By forgetting everything else.

You take what you know, and you put it through your own prism. If I play characters that break down or cry, it's Gary Oldman crying; it's not the character crying.