You feel yourself working to show something. I've learned to distrust that feeling.

I spent the past week here in India getting a sense of the reality of HIV and AIDS in people's lives. Fathers and mothers are dying, leaving children with no support. Stigma and discrimination is ruining the family lives. There is an urgent need for education, information, and increased awareness of HIV and AIDS. The response needs to be now. We cannot afford to become fatigued.

It's thrilling to have the opportunity to work in different areas, whether it's on a project that has all the resources behind it like Harry Potter or James Bond and then to go somewhere there's very few resources.

I was grateful to have two weeks to shoot this one scene in Harry Potter. It's a big, big scene, but they have to deliver. And they have high expectations.

It's not great if someone gives you sort of bland praise without giving you clear direction and say, "This is good, let's try it like this." I have worked with someone who seemed quite inarticulate and just would say, "That's good, that's good." That's very frustrating because - it's nice to know something is good but you know it can always change.

Actors use who they are to be someone else, but I would hate to ever think I'm playing myself. It's imagining being someone else that is the key motivating thing for me. So when people want to know about me, it makes me a bit unnerved.

The film depends on the audience's belief in this relationship.