Everyone had clearly spent far too long perfecting their appearance. I used to feel intimidated by people like this; now I see them as walking insecurity beacons, slaves to the perceived judgment of others, trapped within a self- perpetuating circle of crushing status anxiety.

My theory is that we used to have several personalities, and now we're encouraged to have one online.

What are people going to expect when they sit down to watch a new episode of Black Mirror? And what you're going to expect is somebody with a translucent TV in a drone strike and a robot walking by... or frowning at a phone and going 'aaah! Oh no! I've just deleted my own leg!' or whatever. So I thought well, let's not do that.

It's a barrel of laughs, isn't it? It makes The Day After look like friggin'...insert name of cheerful thing here. It was one of the things that made me really worry about worst-case scenarios. There's something impish and probably somewhat therapeutic about thinking about those things.

I think more and more people became aware that social media was starting to feel like a more toxic space. And, I mean - quite a lot of incidents of people getting very, very angry about all kinds of things and attacking people.

The news might be single-handedly trying to bring about an environmental catastrophe, which it will then report on. Super injunctions are interesting legal weapons really, they don't just gag the press, they gag them from mentioning the existence of the gag. Sport belongs in a news bulletin about as much as a mummified cat's head belongs in a Caesar salad. Combine the "mounting pressure" with the "growing cause" and you've got yourself a "media whirlwind" which you can also refer to.

I actually had that conversation with [Channel 4 Chief Creative Officer] Jay Hunt. We were at a bit of a crisis point. I'd written a totally different script - about war, basically - that got rejected at the last minute for various reasons. The whole of the series was in doubt. I said, "Well, there is one other idea ["National Anthem"]."