David Cameron, writing in the Daily Telegraph, announces that the government will shortly begin releasing data on individual pupils held in the National Pupil database:
From June, we will release data about the performance of all pupils from the National Pupil Database. Of course, it will be anonymous, but you will be able to see what happened to individual pupils: where they started, the progress they made and where they ended up. We’ve also made spending data public. All this will allow people to spot the truth and confront failure where it exists.
There’s a fair amount of academic research on reversing anonymisation – Bruce Schneier wrote about this for Wired Magazine back in 2007.