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 always say, 'I really need to take a break.' It's three days in and I'm getting pretty bored.

Is it appropriate still for a German to have a gun? I only use that as an example of a country that's still deeply involved and engaged in the conversations about how to come to terms with the past. Certainly for that country, it's not forgotten.

You [as an actor] have a responsibility to Jonathan's book and you have a responsibility to talk about a subject that is going to be, whether it's contentious or not, it's going t bring up a huge, emotional response from people. A lot of people will say they are ready or they're not ready.

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.

If I wanted to work financially, I would have made a series of different choices. I do get offered lots of movies which you could make a lot of money out of. And I always say, 'Why would I do that, when someone else could do it much better than me? Why would I want to do an action picture? Why?

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.