Having started out in theatre, I feel an impulse to do it as much as I can

There's always a level where you think you can improve and do better. Certainly at the beginning... I did four years of straight theater without ever having a part in a movie, and I remember being far more nervous on a film set than I was on the stage. It took a while for that to become less so.

I suppose I've always been attracted to this sort of outsider in general - in literature, in music, politics, whatever - and to the person that is able to be relentlessly themselves. I don't think that I have that quality, that strength of mind.

[We were very lucky that Sean [ Ellis ] researched the film [Anthropoid ] for many years.] We sort of piggybacked on his knowledge, and he gave us a lot of materials, which we read. For me, the greatest resource was actually shooting the film in Prague.

I started off in theater; I did exclusively theater for four or five years. In the last few years, television has come along but I can still make film. I feel very privileged that I can move between them.

I'm interested in pressure, I'm interested in duress. All the great works of art, or film or literature, in my opinion, have elements of those in them.

I feel very lucky to be making good work still. The confidence of youth, or that sort of competitiveness you get when you're 22 or 23, the impatience - that's probably been tempered. Hopefully I'm slightly better company.