I believe that Cadet numbers fell by ~4,000 due to the Grob Tutor prop problem, then the harness issue and then the glider issues - however this drop would have been even worse if the Year 8 kids hadn't been allowed to join at an earlier age!
So I think you can safely say that over 1 in 10 have left due to a loss of flying opportunities...
A sad endictment for the 75th Anniversary Year of the Air Cadets
CPL Clott