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.

The culturally specific, in particular, the American porch play that American writers have cherished and loved for many years in terms of their new writing, has seemed to have very little relevance to a much more fast-flowing, abstract, experimental drama that has been emerging in [the UK]. The porch play, not to mention that thing of, Oops, I wasn't loved enough by my father, somehow didn't have the relevance in this country.

Most theater methodology is predicated on the idea of repeated actions. That's what you work toward. Having the actor repeat the same moment eight times a week. In a film, it's getting that one moment right.

You go through a process of refinement and getting rid of the excesses of your early youth in terms of your excitement about what theatre can do.

I'm not really a director for hire. You read these scripts and go, 'This is a really great script, but Paul Greengrass would make this so much better than me.' I usually say, 'I know who would be good for this. It's not me.

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

I never want to make a film. I don't wake up in the morning going, 'Ooh, I'd really love to be on set making a film today'. I'm aware that other contemporary film directors perceive film-making as what they do, as what they have to do. But I would hope that I am more catholic in my tastes.