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"]."

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

Technology by default became the thing that was a new thing that had swept in and was altering it everything.

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

My wife made me watch this documentary about the Iraq War, and there was a really powerful moment where they followed some civilian whose family had been killed. This was 5 or 10 minutes of this woman talking, and it was extremely arresting. You realize how you never hear from the person on the receiving end of a war without a reporter stepping in to compartmentalize the story. Usually they're just a few shots at the end of a news report, wailing and screaming at a funeral.

The internet's perfect for all manner of things, but productive discussion ain't one of them. It provides scant room for debate and infinite opportunities for fruitless point-scoring: the heady combination of perceived anonymity, gestated responses, random heckling and a notional “live audience” quickly conspire to create a “perfect storm” of perpetual bickering.

I can worry about anything.