Watching people just look out for themselves, I think, is extremely interesting. It goes right back to something like 'The Beggar's Opera' - the underbelly of society, how it operates, and how that reflects their so-called betters.

You have to just go with your imagination, where your instinct takes you.

Truth is I don't think God on a daily basis. I think politics, science.

I did 'Deathly Hallows' so my kids could get on the 'Harry Potter' set. They met Daniel Radcliffe, who was a darling and couldn't have been nicer to them so I'm a hero right now.

Filmmaking is something I have to do. It's not something I particularly want to do.

I love acting. It's the one job I know of where you can go in, go through complete catharsis - emotionally, physically sometimes and mentally - and at the end of the day say, 'See you in the pub, guys.

There's no such thing as an actor giving positive criticism to a director. The minute you say 'Don't you think it would look nicer', that director's going to hate your guts. Particularly if it's a good idea.