A 'degree' on its own isnt really any useful for being a pilot.
However the skills that you would learn at University would be INVALUABLE!
It's not just skills like teamworking, communication, intellectual, problemsolving or leadership but personal development; like maturity.
If all you want to do is 'just get a degree' Id say dont bother, save your £££ (~£25k with the new higher tuition fees) and go straight into flight training.
If howver you want to develop those skills listed above, which is what the AIRLINES WANT; do a bit of research, choose a subject you enjoy, and look for other opportunities like University Air Squadrons where YOU get PAID to LEARN to FLY!!