I fell in love at 14 and I remember that mad, tense feeling and all the mad things you do for the person - all those extremes and all the stuff you don't mind putting up with.

The movie is so fun. I've done period pieces before but nothing with this twist. And the movie is just full of such wonderful people, such young actors - people like Matt Smith that I've been friends with for a while.

I've said I won't eat meat until the whole world can eat it responsibly, which is going to be hard. It's becoming more and more fashionable to eat more and more meat and they've just made it fashionable to eat meat in the east in China, which is a massive population.

I wanted to become an actor. I went to Guildhall School of Music and Drama, which is one of the main drama schools in London where you go when you are older. But I was doing the junior one when I was a kid. And some friends there had agents. I was fourteen and I was like, "I want an agent! It sounds awesome!" I had no idea what that was. I thought those guys looked like men in black. They were hanging around in suits all the time. So I luckily got a very good agent in London and started auditioning. And then when I was 16, I got my first film and I've been working ever since.

What is life unless you're having a good time? I don't really have a plan; I just try to dip my toes in different ponds.

I live for challenges. In my career, all I want to do is try to challenge myself and have a varied career.

Nothing's been changed overnight. It's like watching your cat grow: you see it every day, so you don't really see it change, you wake up one day and it's a bloody great thing. Your friends come round who you haven't seen for a couple months and they're like, "Oh my god, your cat's grown so much again." And I'm like, "Has it?" But when you're living it... I just find that my life has subtly changed bit by bit, so I don't ever really notice it too much.