Being the only writer on a successful show is very rewarding.

Time travel is always more magical somehow when you go into the past. Traveling into the future is something you do, every day. You're just not going to get very far. So, I rather like the past travel.

Never run when you're scared. Rule 7.

There’s this issue you’re not allowed to discuss: that women are needy. Men can go for longer, more happily, without women. That’s the truth. We don’t, as little boys, play at being married - we try to avoid it for as long as possible. Meanwhile women are out there hunting for husbands.

I hope I won't become hated by geeks everywhere, but I don't really know comic books all that well.

The trouble with a series as it gets older is it can feel like a tradition, and tradition is the enemy of suspense, and it's the enemy of comedy. It's the enemy of everything, really. So you have to shake it up.

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