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.

My agent in London told me, after Never Let Me Go, because I loved doing that so much, "If you're on a lucky streak and you're doing well, you should only take a part, if you can't bear the idea of anyone else doing it." That's been the case since then, with Drive and Shame and the play (The Seagull), and the stuff that's going on, like Gatsby. I would have been devastated, if I hadn't gotten those jobs.

I remember in 'Pride and Prejudice' I had to do a scene where I broke down. And before we filmed I spent like three hours imagining my mum's funeral. Actually, she's very much alive, happy and healthy. It was really horrible.

It doesn't matter what you feel - ultimately, it's what the audience feels. You can finish a scene and think to yourself, 'Oh, God. I was so deep in that moment,' and find it just didn't play. I don't know if I have very good radar about that or not.

I am committed to helping Alzheimer's Society in any way I can. My family and I rely on the help of organisations like Alzheimer's Society to help us understand the disease and guide us in the care of my grandmother. It's been a privilege to meet so many people with dementia.

It's funny that you can murder someone horribly and graphically and disturbingly in a horror film, and it's not an NC-17, but if you put a naked man on screen, everyone freaks out.

I can actually cook one meal now, as opposed to before, when I could cook nothing. My family are very excited.