The logic for me, in writing it is that the different areas or different years are almost like different rooms.

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

'Waldo' was one episode I always felt I didn't quite crack. And weirdly, now that feels like one of the more prescient ones.

I tried to be all intellectual and erudite and with others I'd just swear and curse and be an idiot. And suddenly, when they're all in one space, I don't know who I am.

I think people are starting to look away and questioning, and they're sort of horrified.

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.