Telboy,
without a doubt go to uni. Have the best of both worlds - indulge in partying and studying whatever subject takes your fancy. Any will do - I know archaeologists, nurses and lawyers who became pilots after uni.
Remember after the Gulf War it took BA several years to start recruiting CEPs again, but don't worry. You have years before you hit the max age for most sponsorship schemes.
Uni will allow you to develope answers to the most difficult questions any airline will ask you. It will give you examples to put into the 'describe a time when you fulfilled a leadership role/showed dedication/solved a difficult problem/etc'. Join a UAS. Get a PPL. Make sure you leave uni with a sports team blue and/or were a team captain or president/secretary/treasurer of a society.
With your a-levels and a few hours flying at the moment you are much of a muchness with the 20000 other people who want the sponsorships. Even in a good year, only 300-400 or so will succeed. By all means apply to any deals you can find, but use the opportunity of a lull in the recruitment market to have fun and hone your skills to perfection.