Gunners - regarding a UAS it'll depend hugely upon your chosen University and degree. These days the UAS attempts to 'stream' you for FJ, ME or RW depending upon how well you do. But you're also trying to get a decent degree, of course.
If you're trying to do Aero Eng at Impossible College, London and also have to travel all the way to Wyton to your UAS, you'll find it very, very hard. The other alternative is to wait until after finals to apply to the RAF and let them know that the reason was that you didn't think that you'd be able to devote sufficient time to your degree had you joined as an undergraduate, given the additional pressure of achieving sufficient flying currency to progress at a rate which would mark you as a FJ prospect.
Other flying is available through the RAF Flying Club Association, but it is NOT free. Perhaps you could try for a GAPAN PPL scholarship or Air League award?
Good luck!!