When I was younger, I would mess about and have a laugh with everyone. I was doing Atonement when I was about 12, and as we went to do this very serious scene, the director Joe [Wright] came up to me ... I'd been giggling right up to the beginning of the take. And he came up to me and said, "Okay, you need to be serious now." I completely idolized him.

All teenagers want to rebel a little and break away. But I think you are always going to want to go back to your parents for that safety they provide.

I don't think you could get anything worse than losing a child. I think if my child died, I would prefer it if I were dead.

I listen to everything. I love The Chemical Brothers.

That's what acting is. You're pretending to be someone else.

We've done a lot of films now about the IRA, we can move on from all that. I loved '71 because I think it showed a very honest trail and what it was actually like. It wasn't one-sided. I really respect ['71 director] Yann [Demange] for what he did. But we have done a lot of those things.

'Romeo And Juliet' is the classic love story. When two lovers are separated and trying to get back to one another, that's fiercely romantic and something you become glued to.