Air Cadets will give you a Gliding Scholarship and possibly a flying scholarship. You could then become a Staff Cadet at your local VGS (gliding school) where they will train you to become an instructor on the Grob motor glider.
Try GAPAN nearer the time as they have scholarships:
Flying Scholarships 2010 - GAPAN
Air Cadets - Home
RAF Odiham - 618 VGS
YouTube - 212 Risca Sqn Air Cadets Recruitment Video
I'm not Welsh - the vid just looked one of the better ones!
Get stuck in....the rest will come with 110%!
I joined at 15 and today at 36 - I still can't shake it. If it wasn't for the ATC, I wouldn't be an airline pilot. You will learn leadership, citizenship, teamwork, pride, marksmanship, satisfaction....you complete the list after 6 months.
YouTube - ATC - air cadets recruiting video
See the site for N. Sheffield Sqn and S.Sheffield Sqn