I am neurotic, and I'm a worrier.

"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.

That's not something that we've gone in thinking 'Right! How are we going to examine that now?' It's just when you take a step back you see that they're actually all sort of in that mode.

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

In Britain people might know me more for my comedy writing background, things like that.

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

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