It's a very Douglas script.

Are you trying to re-inject some of that sort of type of humour into this production or is it a different horse for a different course?

Well, it's different in that it's audio and not visual, so some of the visual gags go but you don't have to inject anything with Douglas's scripts. That's what's so lovely, you can just get up there and open your mouth and it works. He had a very specific sense of humour - all those undergraduate jokes and things are terribly Douglas.

It's actually lovely to be doing it again, it reminds one of doing [it the first time], because we did in fact record an awful lot of it. We did all that filming down the Cam on a punt, Tom and me, and so I have quite a vivid memory of it all actually, which is a help I think. I'm jolly lucky, I can stand there and remember going through books in Professor Cronotis's room and climbing up ladders and chucking them down for the Doctor to catch. I remember it pretty well actually.