I'm a worrier. In the UK, if I'm known for anything, it's sort of for being cynical.

What we were also trying to do is vary the tone slightly across the season of Black Mirror, because there are six stories this time around, so you don't want it to just be the devastating, bleak-em-up.

"Be Right Back," in which Hayley Atwell brings Domhnall Gleeson back from the dead using his social-media profile, sprang out of an unrelated conversation. Other stories you thrash away at for weeks and weeks.

I would say the thing you can still see in Black Mirror is that I was probably traumatized by the specter of nuclear war. I was born in 1971, and in the '80s I came to understand that I was inevitably going to be frazzled to death in the nuclear apocalypse.

I was more aware initially of shows like Tales of the Unexpected. And the BBC used to put on a lot of one-off, bizarre television plays.

Technology isn't the villain and the people aren't often really the villain so much as they're weak.

There's something I find very satisfying about a nice ironic twist.