seeing as we are talking about a politician, and the leader of the arguably (and I thought new labour under blair/brown was unbelievable terrible) the most deceitful and despicable uk government ever. my money is on lying, bending the truth, misleading, misrepresentation of the facts or however you want to put it, it's one thing this government excels at, probably why they do it so much, they stick to what they are good at, must be good as on the whole they get away with it with minimal journalistic or public scrutiny, heaven knows there isn't a fat lot of anything else this bunch of clearing in the woods are good at. In the interest of fairness, maybe Osbourne was a mean towel folder, and Cameron does a mean impersonation of a boiled ham.
Who knows though, with the grasp of mathematics Cameron and Osbourne have displayed their calculations could show anything.