I will never, ever do a film as successful as the Harry Potter series. But neither will anyone else.

I feel very English in a suit. There's something about being in a suit abroad, particularly in America, that feels empowering.

I don't want to say I'll never play someone with a cockney accent, but I think I would be irritated by me doing it.

I don't think that you necessarily need a certain type of background to take on roles. You see actors from very, very privileged backgrounds playing working class characters and vice-versa. I don't think your background limits you as to what you can do.

It's mainly about working hard and proving to people you're serious about it, and stretching yourself and learning. The mistake a lot of actors make, particularly young ones, is allowing themselves to feel that they're the finished articles, the bee's knees, and it's not true.

We sing a lot of the soundtrack in this film [Swiss Army Man] - me and Paul Dano - and on the last day of filming we had to just get into the back of our sound mixer's van and record a really crappy, rough version of the singing then. For some reason that was one of the most fun days.

I really enjoy working physically.