Cats
Fairy snuff, me old - some clubs are a lot cheaper than others. I guess you would also have to take into account travelling costs to get to a GSA club versus a more expensive local civvy club as well. Although you would benefit as a youngster in other ways if you want to join any of the 3 services in the future by flying with any of the Service gliding clubs (the army and navy as well as the air force ones).
LJ