Moffat told SFX: “Two episodes. Two mini-episodes. Very, very small episodes – maybe eight minutes in total, so that’s around four minutes each. It’s not a spoof. It’s in the style of the ones that we’ve done for Children In Need, so it’s taken seriously as a proper bit of Doctor Who – funny, but not a sketch. A little miniature story.”

He continued: “One’s called ‘Space’ and one’s called ‘Time’, so they’re Space & Time. And there’s a moment with two Amy Ponds in it. If you’re a red-blooded male surely that’s enough! You’ve got Amy Pond flirting with herself.”

He added: “It’s everybody’s personal fantasy! I’m really, really pleased with them. I think they’re really good, really very funny. It’s Matt, Karen and Arthur, and there isn’t a guest character. It’s just the three of them. A moment of life aboard the TARDIS. But obviously life about the TARDIS instantly gets you into terrible jeopardy, and all of causality is threatened. As I’m sure it is every day when they get up and have their coffee…”

Red Nose Day 2011 takes place on Friday 18th March. The charity helps to transform the lives of poor, vulnerable and disadvantaged people across the UK and Africa.