I'm just old enough to remember fairly clearly watching Sylvester McCoy, the Seventh Doctor, on television, and obviously the old repeats.

I've seen Tom Baker and I've seen Jon Pertwee doing it but not much to be honest.

What got me interested in this job was the fact that it was a Douglas Adams script because I'm a huge Douglas Adams fan, so as soon as they said those two words I just said yes. 'Do you want to read it first?' [they asked]. I said 'No, yes.'