I shared a caravan with Peter Davison|Peter Davison once. But I thought I'd better not tell him that I'd been a big fan, cos we're sharing a caravan – he might get a bit scared.

I think it's like all these relationships, like The X-Files|Mulder and Scully and Moonlighting (TV series)|Moonlighting, you know. Moonlighting Jumping the shark|jumped the shark when they got together, didn't it? I think you have to be very careful. Which doesn't mean to say that we don't see the relationship developing and becoming something that it maybe hasn't before. But I think you have to be very careful with those things.

The story between the Doctor and Rose is basically a love story without the shagging.

They weren't shagging in the TARDIS, because that would be weird.

The Doctor does have some long speeches and he talks very quickly. Learning all his babble can take a while, but it's very well written babble so I don't mind and you do get quicker. When I filmed Recovery during the break in Doctor Who I would sit down at the weekend and learn the script in an hour and I was like 'Hang on??' You do get used to it though.

I really wouldn't. We have such good writers on the show. And I couldn't walk up to Russell and hand it over and say 'Here's 45 minutes for you' and then he would have to hand it back and say 'Thanks, but it's shit!'

I would quite like to try my hand at directing although I would do it in the theatre rather than in TV or film. Theatre is more just about telling the story. I understand the way the theatre works. I will leave the TV to the experts. Doctor Who is very complicated to direct. It would be impossible to direct that and act in it as well.

"I like to be called master, especially by people called Layla..." Tennant at Live Earth|Live Earth concert 2007