I was wondering when you were going to comment Phil? Hit the nail on the head.
ersa - I agree it is morally wrong for an organisation (CAA) to 'run' an exam system when they have a financial interest in you failing.
QB does change a little each time, high risk strategy in GN,FP, MB as it is easy to change numbers others you'll get away with it but your comment adds even more weight why the system needs to change.