The Snowmen: publicity coverage

The Clara you will meet in the Christmas Special is living in Victorian London, working in a pub, also living a bit of a double life as a governess looking after some children ...

We've already met Oswin in Asylym of the Daleks ... Basically it's what been referred to as "a soft mystery", and if anybody's hoping to get any answers ... it's something that will be ongoing for quite a while and in true Steven Moffat style you won't really get any answers in the Christmas Special, it will just raise more questions, and get more and more complicated and fascinating.

It's a mystery. I've met the Doctor once before, which he doesn't quite know yet, and it all begins to piece together and I keep popping up ...

It's been a really interesting process for me and for Matt how a new companion will change the Doctor and vice-versa, and trying to find our dynamic and how we're going to move forward with the show. It's been really interesting, like Matt said, the kind of days where he would be discovering things and finding ways in which the Doctor is changing and is different with his new companion.

They're figuring each other out, and it's just wonderful to see it at the start, because it reinvogorates the show. You see these two people meeting, and sussing each other out - so it's about learning how they get on together, and seeing them size each other up.

I think there's always a bit of sexual tension between the Doctor and the companion ... so I hope so!

The Doctor under Amy and Rory eventually became like their pet, he was just this sort of strange pet that could talk, that would sweep in every now and then. He's meeting someone new because he presents himself in a hew light and she forces him to be a different version of himself slightly.

As always with Doctor Who, the essence and heartbeat of the show is the same – old alien, hot chick travel through the universe and get into capers. That will always be the heartbeat of the show and it's whether it’s more flirtatious, whether there's more attraction, whether there's more zing, you'll have to wait and find out. I’m sure we'll cover all that territory.

There's a great deal of time that's passed in cunning story terms. It's great because you kind of go: "500 years later..." but the burden of that loss will always be with him. Like the burden of losing Rose Tyler or whoever it is – is always with him to some extent. But I think particularly for my Doctor it is. Amy and Rory were so significant. But what I would say as well is I always think it's important for the show for that grieving to have its place but move on. I felt it affected Martha's journey quite a lot that he was always talking about Rose, which is completely understandable, because the Tenth Doctor and Rose had such a wonderful connection but the show has to propel forward back into adventure mode.