"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'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

Men Against Jive is a brilliant title! That's a military story, that's a difficult one to explain really because that's sort of a war... it's not just a war story.

One of the benefits of aligning yourself with an indistinct cluster of people is that claiming to feel their pain is often enough.

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"]."

When you're being earnest, people think you're being sarcastic and when you're being sarcastic, they think you're being earnest. The moral in all this, of course, is that people should never attempt to communicate.

I can worry about anything.