[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.

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.

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

It was very much about performances, the whole ensemble thing was just great - everybody working together. Sometimes it didn't feel like a film set. It wasn't technically driven, it was very, very enjoyable

I'm terrible. I'm the wrong person to talk to, I really don't know a thing.

In terms of trying to improve as an actor, for me it's always important to return to the stage. After doing a piece of theater for a prolonged period, I can think I must have surely improved in some way as an actor - you must be fitter than you were prior to doing it. For me, theater is very, very important in keeping things fresh and dangerous.

I've always felt kind of safe on stage, protected. I've talked to other performers about this and they feel the same things, particularly in the live arena. I never get nervous going on stage to do a play. Doing film or television I'll have more butterflies.