Although I have been reading this thread with interest the only thing I've got to add is that the comments regarding the examiner availability are true - you should have taken that up with the CAA. The CAA written policy is clearly posted on the notice board with contact information for all to view. However I do apologise as it does appear that this information was not passed on to you by your instructor and feel free to contact me regarding the issue.
I'd also add that when a student was disenrolled from the APP they receive their funds back as they complete each element of their training. However, the APP for the last couple of courses is pay as you go, per hour.
I'll let everyone else get to their arguments.