Sherlock Holmes can be wise and funny. He wasn't, at the beginning. But later on, he's got a bantering relationship with loads of people. He's got a wisdom that he didn't have in the early stage. But he stays on the mountain top, and he will die up there. He's not going to change that.

I was called a misogynist because I was reducing women to mothers. 'Reducing women to mothers' – now there is possibly the most anti-women statement I've heard.

When you're surrounded by friends and exes, there's a whole lot of stuff that starts crawling out. But however serious and traumatic those experiences may be to the participant, to the onlooker they're hilarious.

Madame Kovarian: The anger of a good man is not a problem. Good men have too many rules. The Doctor: Good men don't need rules. Today is not the day to find out why I have so many.

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.

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

You'll go out of business if you think people are stupid.