Hiya Jack,
Three main thoughts:
Have you been to an area control centre? I too would prefer to work in an aerodrome environment, but when I went to visit Prestwick a few months back, I thoroughly enjoyed it and realised that I wanted to be an ATCO in general more than specifically an aerodrome ATCO. You never know, you might be surprised how much you like it!
NATS will let you specify which stream you would prefer if you are successful in their selection processes - you can specify a choice of aerodrome or area before you start at college (that wasn't the case a while ago) so it's not just random selection. I asked for Aerodrome and got it, so there's hope yet...
The harsher one: Why are you asking now? You must have either 2 or 3 years left at uni, and I thought that should be your priority at the moment. And there is the final thing to consider - what if you don't make it?