If you try to go for a laugh, it's death to the comedy. Personally, that's how I approach comedy. But I'm no expert.

The thing about acting is even if you get technically more skilled at what you do, every time you begin a film or a play you're terrified. You don't know if you're going to pull it off. Every film and every story has its own set of challenges. I've never felt like, oh yeah, that's it, nailed it! You can never sit and rest. That's why it's such an exciting job. It's beginning again every time you begin again. New story, new character, new place, new time, new director. It's like moving to a different planet and trying to figure out how to live there.

Normally, I would do research. For The Constant Gardener, I played an activist, so I went to meet activists. You can find them dotted around. But with The Brothers Bloom, I couldn't meet a nutty heiress who lived in a bubble in a mansion. There was no one to meet. So this was just an active imagining, a daydream.

I always do my interviews face to face.

Well, I'm not at all like the tough, sexy femme fatale in Confidence but it's fun to play people who're really different from you, from different cultures and places. I suppose I'm a bit quieter than most of the people I play.

I moved to New York last year and I love it. It's a huge change and I've always wanted to spend time there. It's like a more intense London, and everything's up a few notches. The lights are brighter, the pace is faster and the food's better.

I just think that things get easier as you get older and wiser and more experienced. You get more confident about who you are as you get older. I find that really comforting.