Wouldn't have thought you would get much flying out of Air Cadets.. I know the guys down here only get 1 - 2 flights in gliders for the whole time the're in the club.
If your serious about it apply for a Navy (or RAF) Gliding Scholarship.
They are great, fun and intensive weeks at (in the Navys case) at a station such as RNAS Yeovilton where you stay in the offciers mess.. and fly on the station.
You get LOTS of gliding in and lots of powered flying in.
It's great fun and will really give you the flying bug.