I was quite straight-laced. I was quite academic until I was about 14 and then I went to boarding school where I had the opportunity to continue to be very academic, but got less interested in it and became more involved in acting. And then when I was applying for universities I used a couple of places on my UCAS form to apply for drama school without telling anyone... but didn't get into drama school. But that was the most rebellious thing I did.

I've always been quite careful about what I wanted to do. I've just never wanted to revisit old ground or do something that's easy. I want to do something that I would look at and go, "I don't know what to do!" The most exciting thing is when you're a bit scared, so I'm looking to find something that's really terrifying.

Leonardo is the most incredible actor, on the planet, with a couple of people alongside him. Getting to act with him is just [amazing]. I walked away from my audition for that and I couldn't believe that I'd been acting with him. I've worked with amazing people, but my friends freak out that I'm working with him. I freak out in a geeky acting way. They freak out in a starstruck way. He's Leonardo DiCaprio, and his fame is so big. That's a complete tangent about that.

I don't really think about roles - "dream roles." It's always about who's gonna be the person on the screen or who's gonna be the person on the stage and who's gonna direct it and put it all together.

With theatre especially, you don't want to do it unless you love it - there's no way you can pull it off, making people happy, making yourself happy for 12 weeks or whatever.

People get married when they're 18 and spend their whole lives together. I think their greatest fear is that someone will see it as a fling because they were young and it didn't mean anything.

I was trying to find ways of not being pigeon-holed like that. I didn't want to be tied down by my accent. I wanted to play Americans. I don't want to ever be doing the same thing twice, and I just didn't want to repeat myself.