The individual schools obviously know their own pass rates and some of us publish them, as Paco says. The problem is that leaves it open to FTOs to massage their results, or to be selective, to give a distorted impression and without public access to the raw data no-one can challenge them.
I'd be very much in favour of results being published across the board, but it would have to be done by the CAA or some other independent agency. As it stands it's not a case of the FTOs stopping the CAA from doing it, the CAA have decided for themselves not to do it (citing 'commercial confidence').
While you'e busy trying to encourage openness at the CAA, see if you can get them audited by the QCA in the same way that A level exams are audited - that would open a lovely can of worms.