Sometimes if you're a director, you want to believe that you're great and capable at all aspects - the technical side, the lights, everything - but I'm not.

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'm very, very excited because I'm just completing Episode 6 of Series 4 [of Peaky Blinders], which again I think is the best yet. And I'm loving it and it's not like work, it's not like a labor, I love doing it, and the boys are coming back and they're loving the scripts.

In other words, when you have someone [like Ridley Scott] with that authority, then you tend to be left alone. But they were good and they're really good people, and I'm a big champion of the BBC and I think that like minds find each other and I think that FX and BBC is a perfect match.

I read more and more and I came across this character, Caroline Weldon. Sometimes in history, you find these people that no one would dare create. They're too mad.

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.

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.