There is also a Volunteer Gliding Squadron at RAF Henlow. As they fly Grob 109b (Vigilant) motor gliders you might find a home there. I met some of their instructors at last year's BoB Reception, and ISTR 2 or 3 with a similar background to you.
Their (under construction) web site is here:
616 VGS Web Site, which has a contact email that might be worth trying.
STH