Rich
You'll find a lot on this topic if you do a search. Here are my views, some will agree, some will disagree.
Firstly if you failed A level maths you ain't going to pass a BEng. I have one in Aerospace engineering and it was bloody hard, makes a levels look easy. If you are doing this degree to become a pilot don't. Do maths or Physics seperately. Aero eng does not get you into an airline and the uni's take a dim view of people doing it to become pilots. I should know.
If you are set on flying, go to Gatwick for a class 1 now. This may make your uni decision for you if you fail. Otherwise you know you can begin. Now have a few lessons - not trial flights - and see how you enjoy it. Keep uni options open until you're sure you do.
Once you're sure of what you want and it is flying, forget uni and start working every hour available, doing your PPL on the way, then your writtens. Then work and go to banks and relatives and get enough to do CPL/IR in one. If your lucky your folks may even re mortgage for you. I worked for a couple of years then got a loan for the rest.
IMHO if you go to uni that is 4 years you could have saved for your licence and got it. These days you'll come out of uni with almost as much debt as an ATPL. But no where near as much fun.
Don't make the mistake of thinking flying is the easy option - it ain't. Again you'll have to improve on your A level performance to get through the writtens.
If your still undecided then go to a 3 year degree, live a little then review your situation. As you probably know the market ain't too good anyway so you may not miss out on much.
Cheers