I find it rather easy to portray a businessman. Being bland, rather cruel and incompetent comes naturally to me.

If I can get you to laugh with me, you like me better, which makes you more open to my ideas. And if I can persuade you to laugh at the particular point I make, by laughing at it you acknowledge its truth.

All humour is critical, you know? You make stupid jokes. I mean, stupidity is an infirmity, isn't it?

Nerves are always a big problem for me, which is why I loved doing American sitcoms. Because you know when you do the take in front of the audience that you're going to do it again afterwards. A minute after you finish, you just go and do it again. So, there's that sort of safety net. And then if you made a little mistake or two, they'll go pick it up, so there's nothing to worry about.

On movies, I like to involve the cast in the writing of the script. I like to have a rehearsal period, after which I do the last draft, which gives me a chance to incorporate anything the actors have come up with during the rehearsal period, so I'm very inclusive as a writer.

You go in and meet the head of BBC One and get an assurance about not dumbing down. And then, of course a few months later, he's been replaced by someone you haven't met.

I think you can write very good comedy without a partner, but what I love about it, working with a partner, is that you get to places you'd never get on your own. It's like when God was designing the world and decided we couldn't have children without a partner; it was a way of mixing up the genes so you'd get a more interesting product.