I'm just coming up to my last A level exam now. I decided to take a gap year in Year 12, and am really pleased how it has worked out so far.
I've been given a placement in TRW Aerospace in Birmingham, and am also being supported in terms of furthering my German and university level Maths (to keep it fresh in my mind!). They also are sending me on a residential "Business Awareness Course". The pay is good, and although Birmingham isn't the exotic gap year ideal, it's a lot more than many other mates have got planned!
I'm going to use just about all the cash for flying, so in this sense, I see it as a vast help towards my career prospects.
If you are serious about a gap year, check out
www.yini.org.uk which is the Year in Industry scheme website. They also offer you a chance to travel for a few months at the end of the gap year with Raleigh International if travel is what you are looking for.
Plus, BA aren't the be all and end all of flying, but if you can find any of the websites for the cadet pilot groups that BA have recruited, you will notice that it's normally only 1 or 2 out of 16 or so that are anywhere near 18! - Although, that isn't saying that you have more chance if you do go to Uni! (Not trying to spark off another Uni or not debate!)
Good Luck,
MS