When you're watching, I find two things happen. You either watch a film and it's really good and then you think, "Why can't I do that?" Or you watch a film and it's not good, and you think, "Why am I doing this?" So either way, it feels like being at work.

Just the idea that someone is married and they've got a kid, and he reports for work one morning and his boss says, "You're wife is a spy. Shoot her." In the real story, he just went back and did it, which would have been a short film. Therefore, I had to spend some time exploring what you would do.

I am someone who thinks that if you've got an actor like that who wants to perform your work, then you should do it, and hopefully Tom [Hardey] likes to do the work that I do, so long may it continue.

The story [of Allied] stayed with me, like a stray dog outside the office, waiting.

True stories are always good because they're so odd, and so unlikely.

You know that when you suggest something on the page, it's going to be there, plus more. It's a great luxury to know that you don't have to push it. You just lay it out, and it will be there.

The sandstorm, which I think is an absolute triumph, could have been awkward. It's sex in a car, so who knows. And I think the rooftops look fantastic [in Allied].