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

I think that the process of making a film is an underrated factor in how that film turns out.

I'm 5-foot-5, and I'll wear a big parka and put the hood up, and nobody gives me a second glance.

Because I'm short and slim, I can identify with somebody who's an unlikely fit for something and desperately wants to be part of it.

Personally, I prefer the dark side.

I see myself doing Harry Potter films as long as I'm enjoying it and as long as they are going to challenge me as an actor. I want to be an actor - it's my aspiration - so I want to do other films. I want to write something and I want to direct something!

I've always had, like, from the age of about 11, I've had such an intolerance for bad behaviour of actors that I don't think I was ever going to be that person.