"What attracted me specifically to 1956 was that I was trying to find an historical event and the Suez Crisis was just a brilliant moment because it had so many parallels with today, which was whether this country was right to go to war in the Middle East," she says. "But it's also a country in transition, there's a huge movement coming up in art and novels. You know, Look Back in Anger at the Royal Court Theatre, clothes and teenagers. There were riots in cinemas when Rock Around the Clock came out - there was a sense of change. It's the cusp of the Sixties really."
Not only a period when society was changing, but also the BBC with it. The Hour follows the creation of a fictional news programme similarly striving to break away from the static, staid and deferential newsreels of the era - all royal walkabouts and debutante coming-out parties.
The drama centres on the triumvirate of Romola Garai as Bel Rowley, the show's producer, a young woman in a man's world, Ben Whishaw's chippy working-class reporter, Freddie Lyon, and Dominic West from The Wire, as the show's front man, Hector Madden, a public-school war veteran and married ladies' man who sets his sights on Bel.
Bel is based on BBC's legendary head of News and Current Affairs, Grace Wyndham Goldie, who was responsible for such groundbreaking shows as Panorama, Tonight and That Was the Week That Was. Romola Garai gives an earthily intelligent performance as Bel, and what's more, she's not shy of mentioning the M words.
"People might want to watch The Hour because of Mad Men and then they'll see that the worlds are vastly different," she says. "When I watch Mad Men it makes me very aware of how different America was in the Fifties. The war affected Europe so differently, and what's interesting about Suez is that the Americans didn't get involved because they had moved past that desperate, very public colonialism. Britain was still marching round the world thinking they could stick flags in places."
Dominic West agrees with Morgan that the 1950s are a rediscovered decade. "Ten years ago nobody gave a thought about the 1950s," he says. "Now it seems to be very much of the time. Originally, I thought that that's not a very great thing - the Fifties is what we all try and get away from. But now I see there are so many parallels."
LOWDOWN
What: The Hour
When: Saturdays 8.30pm from Nov 5; encores from Wednesdays 7.30pm
Where: SoHo, Sky Channel 010
-TimeOut / Independent