I spent a lot of time with a real detective, a lady detective inspector who was the only female detective inspector in the whole of East London. She and I hung out a lot. She showed me what she did and I spent time with her. So, [she was] a lot of the inspiration for the way I dressed and sometimes the dialogue in those interview scenes where we're cross examining and questioning the youths and trying to get a confession out of them.

Despite being extremely professional, Michael Caine has a giggle which was lethal for me because once you catch his eyes, once you realize the other person is a giggler too, it's curtains.

Doing press is like eating at McDonald's: while it's going on it's vaguely enjoyable - you're seduced by your own vanity and taking yourself rather seriously - but immediately afterwards you feel sick.

I'm a dual citizen, as are my husband and children. We have got eight passports between us; we're weighed down by them whenever we go anywhere.

I'm just happy to be a film where for once I don't have to worry about my hair, because my managers are always complaining about my hair looking depressing in my movies. Which is true. I mean, it's true.

You never in a million years thought that you would ever end up in a Woody Allen film even though that might be your dream, and there you are. Suddenly you've got one. But you're not playing the quintessential Woody Allen heroine, which is somebody that's full of self-doubt and heartbreakingly naïve. Chloe in Match Point was a nightmare in some ways and totally entitled, and felt like everything was going to be all right. Most of the women in Woody Allen films feel like everything's awful. I didn't understand what to do. But some of the confusion is helpful.

The ratings thing is the real issue. It really hurts movies. For example, in Redbelt, I smoked. The whole plot of my character was based on the fact that I was a smoker. And then they discovered that just by having someone smoking in the movie, it immediately makes the rating an R. So they had to cut out every shot where I had a cigarette in my hand and it totally affected the performance. That was very frustrating to David Mamet as well. I can remember him saying, "It's a nightmare."