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

Don't accuse anyone with the temerity to question your sad supernatural fantasies of having a 'closed mind' or being 'blind to possibilities'. A closed mind asks no questions, unthinkingly accepting that which it wants to believe. The blindness is all yours.

In summary, our world is doomed.

The biggest teenage taboo is being strait-laced. It's easy to tell a researcher you went to a house party that turned into an orgy. It's less easy to say you like eating toast and watching QI.

I kept saying I want to do an episode that's set in the past, how do we do a period episode of Black Mirror? And simultaneously there was another idea we were thinking about and the two things sort of gelled and became San Junipero.

At the other end of the spectrum, George Gideon Oliver King Rameses Osborne, the fourteen-year-old novelty Chancellor and future baronet of Ballentaylor and Ballylemon - a man so posh he probably weeps champagne.

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"]."