Hi A&C, it sounds as if you know more about it than I (but I can assure you I did try). If I read your post right, you don't think its the MAA's fault that its taken more than 17 months to not return to service gliders that were serviceable when they were grounded. So who's fault is it? Even if the paperwork wasn't up to scratch, why has it taken so long? For as you point out, there still aren't any that are actually airworthy and they were grounded April 2014. At this juncture I suppose I should point out that I've owned several sailplanes and even managed a gliding club for several years so I do have a vague idea what goes into keeping a sailplane airworthy.
I don't mean to insult anyone, and I'm sure that some people somewhere are working hard to rectify the problem. I just think that it really is a damned shame the Air Cadets haven't had a serviceable sailplane for almost a year and a half, and simply can't get my head around why.