Every now and then I have to teach directing. The thing about the theatre is that the most important thing you can do as a director is to make sure that everybody is in the same world - you have to create the world and make sure everyone buys into it.

I am, in fact, Superman. Every morning I wake up and go into a telephone booth and change my costume, and then go to work.

One of the great joys of my job is that you spend a huge amount of time investigating different areas of literature.

It's disingenuous to say that criticism doesn't get to you or you don't hear it or that you ignore it. When everybody says, 'That's crap. I hated that,' you hear it. But it's much, much worse when they're right: when you feel that it is an absolute piece of tosh. I made the film I wanted to make, so you just have to find a way of getting over it.

Actually, to be honest, this is a useful time to not be knowing what I'll be doing in 2013 or 2014, because really, for the last however many years, I've known what I've been doing for years and years ahead. You get into a cycle of non-reflection, and that gets a bit scary.

I spent a little time in Germany as a schoolboy learning German, and it's a country I knew very well, spent a lot of time in. I knew the history very well. I've always wanted to do a piece of work about the post-war period, of one sort or another.

I categorically resist this idea that films are supposed to be autobiographical and the only stories you tell are about your own life.