It has to be an actress like Marion Cotillard [in Allied] because there are so many levels to it. It's set in the Second World War, when lots of people were doing things that, outside of a war, you wouldn't do, like killing and dropping bombs. She's doing things that one wouldn't approve of, but it's war.

[2015] it's a time that there's a clash of ideologies, similar to the Cold War. I think that a story like this has been waiting to be told, and I think it's a fresh look at the whole earth-shattering business of the collapse of the Soviet Union.

I find the best way to make things real is to just put two characters into a space and let them talk to each other in the way that they would talk to each other, and then see what they would say. I know it sounds weird, but that leads the plot and takes you in another direction.

It's such a gift when you know who you're writing for and you know that that actor is capable of so much that you can relax a bit.

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

[Taboo] has been exactly the same as working with the BBC in that creatively they do that precious thing which is to only make a comment when a comment needs to be made.

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.