Hi Hawk,
I have just turned 18 and hold a JAR-FCL PPL (A), I have GCSE's from June 2002 and will receive my official AVCE results on Thursday.
I was in a similar situation to you not to long ago, with regards to your question about University, I would say don't go and begin training yourself now.
It is obvious that you are dedicated but so are many other people, myself included. The airline industry is begining to pick up again so do keep checking and writing to those airlines.
Remeber that airlines always have strict selection processes and even fully qualified ATPL's with thousands of hours on complex aircraft and MCC type aircraft can still be turned down. The one thing that does matter in this industry is age, you can never be to young to start studying.