The difference being that most people being taught to RAF training standards aren't trying to pass a degree at the same time, with lectures on all the same days of the week that are available to go flying! I think that my UAS (Southampton) had the highest choprate in the UAS organisation - as we couldn't fly weekends, and about 2/3 of cadets were engineering undergrads. I think they eventually fixed it by moving from Daedalus to BDN, but that was after I'd graduated.
G