Why do they do it? MPs who appear on BBC's Have I Got News For You, I mean.

Conservative Peter Bone was the latest to enter the lion's den and receive a mauling, with an old headline dragged up accusing him of being "Britain's meanest boss" for paying a trainee 87p an hour, and then just as predictably contrasted with another story that he employs his wife as one of the best-paid secretaries in the House of Commons.

It all made for toe-curling viewing as he floundered. But he's hardly alone - off the top of my head I can recall fellow Tory MP Michael Fabricant, former UKIP member Godfrey Bloom (the one who said women who didn't clean behind the fridge were "sluts") and Labour's then defence secretary Bob Ainsworth all making similar gruesome appearances. In every case, vanity triumphs over caution. Boris and Nigel Farage are the only two politicians who can remotely pull off such stunts.

One further point: the Beeb's decision to run its other comedy quiz Would I Lie To You? directly before HIGNFY is a particularly cruel piece of scheduling. The former show, thanks to team captains Lee Mack and David Mitchell and host Rob Brydon, is as sharp as a tack and laugh out loud; messrs Hislop and Merton's effort, by contrast, now looks creaking and dated.