This three-part documentary series, narrated by journalist Eddie Mair, looks at the 'darker', money-making side of the comedy world.

The first episode looks at how many comics, in particular stand-ups, make money by performing at corporates. It shows performances from The Real Variety Show where comics play in front of business people keen on booking them for events.

Then it follows the world of adverts, discussing comics like Mark Arden and Stephen Frost (who did ads for Carling Black Label) to QI creator John Lloyd (who first met Alan Davies when Lloyd directed ads for Abbey National.) I know there's a history of comics doing adverts - despite the public outrage at Mark Watson a few years back - but I was suprised at the frequency of appearances. Most of the ads were produced 'before my time' as it were, so were quite shocking in a way. Stephen Fry and Hugh Laurie advertising tobacco?

It's definitely a growing trend, though; if you're feeling bored, you can play a little game where you try to spot how many times in a three-minute period you can hear the voice of Hugh Dennis.

Off all the people on Funny Business, though, the most interesting was Rhod Gilbert. Rhod explained how one corporate gig resulted in him sacking them off altogether, and how he justified doing adverts for the Welsh tourist board because he was promoting a country rather than a product. There were also interesting contributions from Mark Thomas, who attacked just about any involvement of comedians and advertising. The only advertising I can think that he has been involved in was with early episodes of The Mark Thomas Comedy Product, which were sponsored by small independent shops - like a gentlemen's hairdressers and a record shop.

Funny Business declares that the problem with advertising is that there's no funny ads. I can't help but think the problem's that there are ads to start with.