During a recent interview with Ash Tulett, Theroux revealed: “There’s lots of subjects I feel like I haven’t got to. For me, I suppose, a big one would be what people sometimes call Islamism. You know that wing, that far out wing, that draws strands of Islam but turns them into a kind of poisonous ideology that justifies bombings of civilians.”

Understandably, it was concerns over safety that initially prevented him from jetting off to any conflict zones.

“If you subtracted the possibility of having my head chopped off I would be fascinated to go into Iraq and Syria and see what’s going on over there.”

Theroux then went on to admit that he had already dipped his toe into the project, albeit in areas slightly closer to home. “I tried last year to begin making a film with some British Muslims who were more or less sympathetic to what Isis or Daesh, whatever you call them, the so called ‘Islamic State’, what they were doing. And I think it was such a time of heightened sensitivities that it was very hard to build trust with contributors.”

“I would still love to do it”: Louis Theroux on the one documentary he had to abandon