do something you'll enjoy doing at uni, and yes if can get a backup career at the same time. but with any degree you can still convert into law etc. - but try to get a 2.1 at least and also have something for the BA Selection forms for that "leadership" question. Use your time wisely. go to a uni that has a raf squadron and get some flying in. not sure if guildhall does though. i know that ucl does and they are all part of the uni of london, so maybe check out uni of london uni.