Some people can very easily switch off and be guilt free, not that what I'm doing is about guilt, but they can completely disconnect and not care because it doesn't affect them. I've always really cared about what happens and felt a certain responsibility.

When you're forced to watch something in school, you never really enjoy it, you sort of rebel against it in a certain way.

I got cast in a school play and I fell in love with that. I felt comfortable on stage and found out it was a brilliant way of expressing myself and I was happy and I could do it.

Obviously, you never shoot the scenes of a film in order or only very rarely.

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.

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.

The script's always important, but there are some things that have come out in the past year that, when we read them, everyone was like, "Oh my god, this is going to be the next best thing!" Then the movie falls completely flat on its face.