I was always going to act, literally ever since I was tiny. In fact, I have Doctor Who to thank for that. I wanted to become an actor after being obsessed with Tom Baker, the fourth Doctor Who, in the 1970s. His was the definitive performance of all time in anything.

If you speak in a different accent, you begin to move in a slightly different way. You think in a slightly different way. It's part of trying to find what makes a character.

When you're playing a real person there's a balance between playing the person in the script and playing the person as he was in life. You have to be respectful and true to who that person was, but at the same time tell the story in the film.

We seem to spend a lot of our time in very small spaces spouting a lot of dialogue very quickly.

I've always been a geek and slightly awkward… slightly umm… I was never the cool kid at school.

I think doing different accents is part of the job of acting, really. It's something else that I quite enjoy the challenge of, to be honest.

I love characters who are clever and smart, and you have to run to catch up with. I think there's something very appealing and rather heroic in that.