James Watkins: Alex was very attuned as an actor to his own journey, so I didn’t have to police it in an insane way. Plus, if you’re wary enough, you can always give yourself a couple of different colours to choose between in the edit.

but the obsession is with making the tech as backgrounded, unobtrusive and subtle as possible.

There was a real balance between finding clothes that were sort of sad and lonely, and someone hiding their body, but at the same time without screaming, “Oh, that’s a man in a paedophile coat.”

But the idea was an Apple store version of Hell. With these screens on the walls, a room was a prison cell but looked sort of chirpy. The Xbox Kinect had just come out with hand gestures and movements like that, so we put a lot of that into it as well.

We did actually work out an explanation, which used the Grain technology from The Entire History of You. In the original script, everyone had these Grains and we went out of our way to explain this to you. In that version, Daly had to do two things: get the DNA and download the contents of your Grain. But it was just too much business.

The only social media I’ve ever engaged in was Instagram. I was on that for about six months, and then realised I was becoming completely obsessed and addicted by it. Instagram was just a disgusting lie, really. I found I was judging myself based on the appearances of other people’s lives and constantly comparing myself to others. I would either

My sister-in-law is an Ealing MP, and you see how hard she works. Callow’s set up to be someone with a whiff of public school about him. You’d normally go, “Fuck that guy”, so this felt like quite a nice reversal. There’s a key moment about halfway through when his wife comes in and faces off with him, really upset. That’s when you see the personal

So we shaped the script to fit our assets – and even found genuinely Peruvian and Colombian people living in Gran Canaria to be our extras.

Penn Jillette: Charlie did talk about the framing mechanism he wanted to do, and we talked about museums in Vegas, but whatever is great about Black Museum, that’s Charlie. I desperately wanted to play the lead character Rolo, even though it would have cost an extraordinary amount of money for me and Teller to cancel our Las Vegas shows during the