With FX in particular, they've been fantastic and were really hands off. I mean, it helps that you've got Ridley Scott on your side.

Sometimes you take something because it's an offer and it's big and it's good money and you have to absolutely respect that process, because it's not easier.

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.

I think people are drawn to characters that break the rules. I think there is something about a good person doing bad things for what they consider to be a good reason. Then the battle is on to almost prove to the audience that it's justified. How far can you go with that? How far can that character go before people won't accept it? Trying to walk to edge of that line is a challenge.

The time came where I was able to write an original screenplay [Allied], and it would be read and noticed. I had a meeting with Brad [Pitt], just around the time that he was making World War Z. I basically told him the story and said, "This is what I want to do," and he really responded, so that helped me put the thing together and write it.

The plan is that there would be three seasons [in Taboo], and, as with Peaky Blinders, I have had a destination in mind from the beginning, because I think it helps as a writer. The destination in mind is that James Keziah Delaney sets foot on Nootka Sound. But that's a long way off.

I think that helps because there has been no formality of friendship, the politeness of friendship, so we can just work directly on the work that's ahead of us [with Tom Hardey].