Well the Doctor will be pictorially modelled on Richard. He looks like a Doctor, he talks like a Doctor, he is our Doctor. None of us have seen at this point what the actual Shalka look like. We get hints, we get clues, I mean how big are they? How big is the warpgate? So we have constant discussions about how that will impact, what do they sound like when they move across a room, will they explode? How gooey are they when walking across a floor?

There’s a lot of people suggesting to each other about different angles so we can capture a different aspect of the Doctor or the scene and that’s good. It’s been a very much collective effort from the beginning, it’s really been a good crew that way. We’re always stopping and asking ‘What does your interior of the TARDIS look like here? The feel, the door, the new locking system for the TARDIS?' I think we’ve stopped and asked everywhere we’ve gone.