I think you can get better in mathematics on a school level, but when you're talking about being a mathematician, I think that's definitely a gift of genes or whatever.

It's a great relief to feel that you're working with someone rather than for someone. You don't feel that you're being tested, as it were.

I think it would be very difficult to play somebody if they didn't think they had any virtues or redeeming characteristics.

A very, very impressive director, Tomas Alfredson. It's only his second film [ 'Tinker Tailor Soldier Spy'], but he's a real find.

I'm not accustomed to doing films without seeing the script. There are certain people that are auteurs, and you accept them regardless of whether you see a script or not. But Spielberg is not an auteur.

Also the wonderful thing about film, you can see light at the end of the tunnel. You did realize that it is going to come to an end at some stage.

If I hadn't been a part of [Harry Potter] I would have been deeply upset.