The story of James Delaney is also someone who very deliberately presents himself as an individual and plays nations against each other, plays the East India against the Crown, all of those sort of overwhelming concepts that ran the world at the time.

Suddenly, after years of television being the poor relation and film being everything, it now feels like film is a conjuring trick. It's like, "Oh, my god, how are you going to do that in 90 minutes, as opposed to eight hours?! I've got so little time to do this!" It becomes an art form, in itself. Doing both helps you do each one.

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

A commission and an original are two different things, and both have their virtues and vices. A commission is a bit more collaborative, in that you outline the story that you think should be told, and then you write it.

[Allied] got the attention of (director) Bob Zemeckis and Marion Cotillard. I'm glad I waited. If it had been made 15 years before, who knows how it would have looked, but it's got the best possible cast, director and everything. It's been fantastic. It was worth waiting.

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

There's something about the evolution of television where it evolved from to the things that we're now watching and loving. It evolved from film writers, film actors, and I think gradually people are easing themselves into the amount of time they have.