Sorry Enigma, I agree that there is some progression possible, but not really advancing flying skills; I don't believe that flying the Grob Acro Twin as a FSC is allowing them to realise their full potential. That role should have belonged to the ASW19s and the Janus Cs that were binned in 2000 from the Air Cadet Comp Fleet. They will bring on a glider pilot through to Gold with Diamonds if flown properly - the Viking will struggle to get to Silver. Being a FSC isn't really a gliding achievement in my humble opinion, it's more of a leadership/supervisory achievement.
LJ