Every year I've been in my present job, the number of papers back and re-marks has doubled. If enough queries are upheld the school (i.e. the parents) doesn't have to pay for it. Because it's a school in an affluent area, parents seem more than happy to throw hundreds of pounds at re-marks that the teachers and exam officer think are a waste of time and money, but which, with alarming regularity, come back upgraded. Of course some go down, but I think that might be 3 so far.