If technology is a drug – and it does feel like a drug – then what, precisely, are the side-effects?

I am neurotic, and I'm a worrier.

Technology is a global thing and wherever you go, people are prodding the same devices and worrying in the same way and have had their lives slightly altered in the same way.

On the other hand [making a string of one-off episodes], there's a real freedom, because you're kind of reinventing the show every week.

Hi-def is merely the latest in a string of evolutional leaps that have transformed the way we sit slumped in front of a box wishing we were dead.

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.

"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.