RUCAWO
There are 14x RAF Flying Clubs, 7x RAF Gliding & Soaring Clubs and 1x RAF Microlight Club scattered across England, Wales and Scotland. Could they not take up a lot of the slack? That's nearly the same number of flyimg organisations as the VGS.
With the use of the EASA Introductory Flight you can even take up people with a bog-standard EASA PPL/SPL for up to 90 minutes as long as you take off and land at the same airfield and don't do aeros.
Just saying...
The B Word
PS. Cats Five - I am not convinced by any of your nay-saying points over buying new gliders. Granted, you can't just buy them off of the shelf, but given a 2-3 year run as Cpl Clott suggests then I see no reason it can't be done save for cost (although it would probably be cheaper in the long run!). Business is business, and if you remunerate anyone the right amount then it can be done...