By comparison, the Belgian Air Cadets runs a very good 3-year program for 150 glider pilots (intake of 50 per year selected from about 300 applicants).
Cadets are expected to go solo by the end of the first year.
http://www.belgianaircadets.be/public/uk/fleet.htm
This seems to be a very creditable program for a small country like Belgium to pull off. Perhaps somebody from the UK ACO ought to look into how they do it at Weelde.
End of camp music video parody - looks like they were having a great time with a mix of serious stuff and fun. From the credits you can see that there were 6 gliders with one instructor between 5 cadets and 14 other support staff.
https://www.youtube.com/watch?v=mVDJG_4NQ_k
https://www.youtube.com/watch?v=Msopu4IbmyU
https://www.youtube.com/watch?v=YIc-QmzTj6k