I hope I'm always convincing when I act!

I'm perfectly proud of the work I did, looking back at it. I know I've had a bit of a revision since my 'Big Finish' stories came out.

I'm an actor. If you had said to me before I started acting that I'd get two bites of the cherry - you would do things that people will remember forever like 'The Brothers' which I did in the '70s and now 'Doctor Who' - I'd have been overjoyed and I still am.

The waves of time wash us all clean.

I was well aware of the fact that once you appeared in Doctor Who as something else, you were ruled out for the part of the Doctor: that was a kind of well known thing in the business.

I could, I think, quite easily have gone to Oxford. I got four good A levels, but my father's income was such that I wouldn't have got a grant, and he wouldn't let me go to university, and that was the end of it.

It was lovely to do The Knock because I haven't done anything really significant since Doctor Who.