My first time acting for camera really was for Steven Spielberg in War Horse. I was trained in theater and I was actually working in theater at the time. I had a small role with the Royal Shakespeare Company, which is a huge prestigious theater company back in England. I honestly thought that was as good as it got.

I think most actors will tell you the same thing; when you're not working you put 100 percent into every audition.

I hate the word "method acting." It's just so silly. You hear people going, "Yeah I'm a method actor." I'm like, "So what happens if you're playing a period film or something? You're in the Second World War. And what happens when your mom calls you on your phone? Do you go, 'Oh! What is this strange talking brick device?'" No. It's stupid. But you do everything you can to get in that mindset.

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.

I spend a lot of time in L.A., and I think it would probably be easier if I lived there work wise, but there's no city like London, there is so much going on. I can jump on the Tube and be anywhere in 20 minutes, and all my friends and family are here and I'm not prepared to give that up.

People expect your life to change completely. The main difference is I can get work now. I can do my hobby as a job. It's great. It's a privilege. But in terms of the rest of the stuff, I still got all the same group of friends I always had. I don't do anything different. We still go to the same dirty bars and do the same things. So nothing really changes.

Every time I get a role I think, 'I've actually fooled them again, I can't believe they keep falling for this!