“Playing two people that were so diametrically opposed in terms of their characters, in terms of what they were like – it was bizarre,” he said.
“Particularly when we were doing the Christmas special which always happened in September.
“You’re just over the summer and suddenly the whole studio is full of Christmas trees, tinsel, all piles of presents and everything else.
“And so you’re dressed up in deep winter gear, and it’s boiling hot everywhere, so everything’s all wonky.
“And then, you know, I’m in London, doing a war scene around the Christmas dinner table with EastEnders, and then running down the corridors throwing my clothes off with somebody picking them up while they get you in the car and drive down to Wales.
“There’s this whole different vibe to the day.
“So it was a really weird, contrasting thing to play both those characters, but [I was] very lucky to do it,” he said.