What you don't see backstage is what really controls the show.
Before I got Doctor Who, I went to the Guildhall School of Music and Drama. I went back to take the final grade exam, which is the grade you have to take before you can take the teacher's diploma.
I found it a little bit stressful, because I wasn't used to working with Doctor Who. I got the impression I'd walked into the end of seven years and it was all a bit tense.
I don't know if you've ever tried writing a Doctor Who story, but it's a lot more difficult than it initially appears, especially if you've got more than one assistant.
We had a very energetic floor manager and he was always jumping around all over the place. The director would send down messages like, Can you tell that actor to calm down?
I'm not really a science-fiction fan, I quite like the idea of getting away from the science-fiction side of it, for two episodes. It was lovely, it was a super story and great fun.
There are generations who watch Doctor Who together.
I think I must have too much to eat, we were doing a scene where we were crawling, and I ripped my trousers. I was very embarrassed. I was sown in, stitched in, quickly!