Well from what I gather candidate numbers are indeed done on the basis of surname, so in theory combined with the centre number it could be possible to identify a candidate. In addition, each candidate is given another identifier called a UCI (which really is random), but does contain the centre and candidate numbers which probably makes identification easier. And then we have ULNs too for new entrants to secondary school. But its all a bit of a moot point, I dont think the markers see these details any more, with the scanning and onscreen marking that is done these days, they probably just get one huge load of question 5 answers to tick.

There are already sites picking through it (such as http://www.wheredoesmymoneygo.org/ and quite a few surprising entries have already cropped up, such as the massive amount Capita got, but you actually have to know what you want to look for if your going to find anything meaningful.

Bill Gates said A new version in relation to Vista Vista SP2?