I'm playing about four different characters, and I like the technique of trying to be different, even sometimes playing [several characters] in the same scene. It's an acting exercise, in a way.

It's like when I used to do Zippy and George in Rainbow, I used to love that. I wrote about 150 of those programmes as well, and I used to write scenes where they argued with one another because I enjoyed changing the voice so quick. I love this because there's a lot of emotion in it, which is good. Everybody's enjoying it.

I've been screaming, I've been werewolfing, I have been growling, I have been changing my personality from being nice to being absolutely ruddy horrible. I've really enjoyed myself an awful lot.

How are you getting on with Amber and Chris as co-writers and director?

Absolutely superbly well, I hope. Either [that, or] they're being incredibly kind to me. They're a delight to work for. Very firm, but with such charm. It's great.