Determination becomes obsession and then it becomes all that matters.

Nearly every taping or audition has to be in an American accent, so you don't have a choice; you just have to get good at it. I'm sure you can appreciate accents - it's like learning any skill, you have to work at it and work at it and it takes an awful lot of time, until it's muscle memory and you don't have to think about it anymore.

If you go into acting to make money then you're an idiot. It's my hobby and the fact that I'm doing my hobby for a job is mental.

I had a great drama teacher, and he sort of made out drama school as this incredibly difficult thing to get into: 6,000 people apply every year, and some of the schools only have 12 places. It's a phenomenally difficult thing to get into. And that excited me - I wanted that challenge.

I think I got into acting because I kind of had not much else to do! I guess I was kind of looking for something challenging. I heard about the London Theater scene and it was very different from the upbringing that I had and it felt like a challenge. And the whole sort of London Theater schools, I was told that 6,000 apply and there are like 30 accepted to each one. I was like, "Yeah. Let's see if we can do that!"

The Railway Man was a particularly intense and immersive experience. I definitely got carried away. I lost about 35 pounds. I really was incredibly skinny and also quite unwell while we were filming. It wasn't very healthy. I don't recommend it. But then also doing the torture scenes, the water boarding stuff, there wasn't really any other way just to do it really.

Each year we go to the Cannes film festival and I tend to have all my friends pile in the back of my car and we'll drive from London. The poor production company think they're only putting me up and suddenly they've got eight people sleeping on my hotel room floor.