I always thought it would never happen. And then, it became possible. In between commissions, I wrote it as an original screenplay [Allied].

I'm always interested in characters who are closed down, but who open up when they choose to, rather than when they're obliged to. I think that's a very appealing thing, for an audience and just in life. I like the idea that something will say nothing, and then get straight to the point. That feels like how your heroes should be.

The story [of Allied ] itself is the story I wrote, and that's what's great about Bob [Zemeckis ]. You have meetings, but it's meetings for clarity, not to change what they're saying or doing. He takes what's on the page and executes it so brilliantly.

I think it creates so many more opportunities and pitfalls in that you are treading on fresh snow, so you're in a new place.

It's always good to have a world that people don't know about - a world that hasn't yet been done. It's like treading on fresh snow. You're the first one there.

I like to create a character where you believe, deep down, that they don't really care if they live or die. That's very liberating for the character because, if the character is prepared to die, then they can do anything. It's impossible to stop them.

I've spent three hours with Snoop Dogg, talking about how he loved [Peaky Blinders series]. And David Bowie loved it. The late Leonard Cohen was a fan. It struck a chord with various people that I didn't think it would.