Between the marriages, I shagged my way round television studios like a mechanical digger.

Writing for adults often means just increasing the swearing - but find an alternative to swearing and you've probably got a better line.

You can be as beautiful and charming as you'd like, but if you're not terrific at acting, it will mean nothing on the screen.

Rose: Look at you, beaming away like you're Father Christmas! The Doctor: Who says I'm not, red-bicycle-when-you-were-twelve? Rose: [shocked] What? The Doctor: And everybody lives, Rose! Everybody lives! I need more days like this! Go on, ask me anything; I'm on fire!

We're all stories, in the end.

You take this cold, remarkable, difficult, dangerous, borderline psychopath man, and you wonder what might have happened to him had he not met his best friend, a friend that no one would have put him with, this solid, dependable, brave, big-hearted war hero. I think people fall in love, not with Sherlock Holmes or Dr. Watson, but with their friendship. I think it is the most famous friendship in fiction, without a doubt.

Nothing can ever be a rule in drama, because then you're saying certain things won't ever happen, and that would be very boring.