This debate has been held many, many times before. If you try a search on 'university' or 'degree', I'm sure you will get much of what you are looking for.
The crux of the matter is whether flying is your overriding ambition, or whether it is just one of a number of careers you would consider. If the former, then a degree is not necessary but it may be useful - particularly if your flying plans don't work out. If the latter, then a degree is probably essential, but which course you take will depend on the other careers that you may be considering.
Flying - airline or military - does not require a degree of any kind in the UK. Other careers that may interest you may well do. The usefulness of a degree to the dedicated flying wannabe is only that it may make him slightly more attractive to an airline at the time of selection. The subject is totally irrelevant.
However, if you wish to either consider other careers, or to have a back-up plan for failing to get a flying job, you'd be wise to have a qualification that you can usefully take elsewhere. Law, engineering (of any kind), computer studies, music, and accountancy are all examples of qualifications that could provide an alternative source of income. So is plumbing, as WWW is fond of saying - and if you decide to fund your own way through training, you'd be well advised to get a qualification in a practical skill to earn decent money in your non-flying time.
Do that search. Think long and hard about why you want that degree and what you intend to do with it. Don't attempt a degree that you won't enjoy - which means getting as much information as possible about the courses you think you might like to do. If you decide that a degree is not the way ahead, go and get an alternative skill that will keep a roof over your head while you learn to fly.
And look long and hard at the airline industry and be very sure that it's where you want to earn your living before you commit to spending £60,000 on your course!
Scroggs