Online you're encouraged to perform one personality for everyone.

I really don't want to sound like overly negative or critical of the Internet in general because I'm actually really quite pro-technology.

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.

I'm somewhat socially inept. Slide me between two strangers at any light-hearted jamboree and I'll either rock awkwardly and silently on my heels, or come out with a stone-cold conversation-killer like, "This room's quite rectangular, isn't it?" I glide through the social whirl with all the elegance of a dog in high heels

"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.

While I was thinking about that, the military, I read a book called On Killing, about the obstacles people have to pulling the trigger in combat. So sometimes you just absorb all this stuff without realizing you were doing research.

I'm quite geeky and I'm very much into video games and technology and stuff like that.