I've been around UAS's for some time, although not as a student, and I'd confess that since the change in the system, the "drinking culture" does seem to have increased in some places. However, I never saw any "clique-ness" when it came to allocation of flying during term-time, actually I would have said the available slots were massively under-used compared to prior to the report. Not sure about PIFTs, camps etc but fairly sure the slots were doled out evenly.
What the reporter doesn't state though, although she does admit that the UAS is not representative of the rest of Crabair, is that a UAS is effectively a glorified student club, the same as the Uni Mountaineering society, or the Hockey club, or the rowing club. And in my experience certainly the latter 2 involve copious quantities of booze. IMHO the UAS would do well to begin to distance itself from such a reputation.