I'm not in front of the camera, they are. I encourage them; I build up as much of their confidence and ego as possible. They've got to take control; I can't act it out.

I also know what looks good before the camera, how to move the camera, and how to get a story on the screen.

It's very clearly stated in the film: You make your own choices, and what you're always fighting is ego.

It's much easier to work with an unknown.

The SAS is the most elite of the special forces in the world. They are not people who go out and advertise; they keep it inside. They don't want anybody to know about them.

My creative partner is a writer, and he's got an executive producing credit on this film. We've made three films together and I would never underestimate the impact of a writer.