What happened was I was invited to meet Tom [Hardy] to discuss a project that he had in his mind about an adventurer who returns to England from Africa with secrets and with a history, and the original idea was set some 80 years later than it is now. But in the conversation I really took to the idea and I'd wanted for a while to set something in 1830 and 1840 in London, so it struck a chord.

I wanted to take a damaged individual in a damaged society with damaged relationships between nations and take a look at how this individual survives amongst them, and that for me as a writer is the connection that you needed to get inside the skin of the main character and wonder how he's going to cope with all this.

I was 21, when I heard the story that inspired this [thriller Allied], and I wasn't even a screenwriter then.

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

I think that it's not a bad thing to not be too versed in the vocabulary of cinema, because you start to think that certain things are allowed and not allowed.

I'm not suggesting that ours [series] is unique in that, but they can begin to have that depth, that gravity, they can spend some time, so it's a bit more like reading a good novel, if you like.

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.