In England, the referees don't call many fouls, as opposed to Spanish football. Consequently, you must be really strong all through the 90 minutes.

If you're a comic, you don't have a rehearsal room; you rehearse on stage. My main concern is remembering everything. I've written lots of material, but how do you memorise 90 minutes? That's one hell of a long speech. I've always had problems with that.

I think that documentaries are bound by journalistic ethics, and I think they have the pressure of trying to entertain someone for 90 minutes. It's hard, but it's the same question no matter what you're doing. Every film I've done, I've approached it the same way with the same level of respect.

Now I can broadcast to an audience of several million people on the 'Today' programme. I can talk about the day's news. But on radio, believe it or not, we have notes and scripts. And while we might ad lib the odd wryly amusing asides, they come at the frequency of a suburban bus. About one every 90 minutes.