I was never really that interested in the punk movement. I was a blues guy: I liked Motown, James Brown.

Over the years, I have been asked to play these sort of scary frenetic characters that express their emotions physically.

I never told my father I loved him before he died, and I have a lot of issues about that. They're all swimming around in my head, in my heart, unresolved, and in a way it felt fitting to dedicate the film to him.

Each role you play, they set a bar of challenges that you meet. And in the past, I've played characters that emotionally expressed themselves a bit more in a physical way. It was a joy, actually.

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.

By the way, the Harry Potter series is literature, in spite of what some people might say. The way J.K. Rowling worked that world out is quite something.

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.