It's been a long time since I used the courses but I did use both Bristol and PPSC. What I found was that PPSC was an approved school and at that time Bristol was'nt (don't know about now). Now I here you say 'PPSC then', NOPE. What I discovered was PPSC could only teach the APPROVED way (trust me, not always the best way), while Bristol would teach you how to get the correct answers in the quickest time, important consideration in Nav etc.