ND
Hard luck with OASC! Very much the same story for me a few years ago. Don't let failure deter you from your goals.
Presumably there is a UAS attacthed to Bath Univeristy, in which case, apply to them in September at the Fresher's Fair. If succesful you will be an unsponsored member of the squadron but you will recieve all the same training for free.
The UAS is a great place to nurture potential and if you reapply after one year at uni/on the UAS I'm sure you'll do better.