....just to correct your correction...
Its no longer 'RAF' Upavon as the RAF left in 1993 and the Army then moved in and renamed it Trenchard lines ..... but still commmonly referred to as '622 - Upavon'
I guess 622 Trenchard lines would be correct, but then most people would immediately ask ...where?
Correction noted but I'm surprised the airfield is operated on behalf of the Army now; often when they move onto an ex RAF airfield they find some way of destroying its capabilites; just look what they did to Catterick which of course used to have a VGS. South Cerney also used to have a VGS (625?) and once hosted the gliding world championships but having a tall fence all round the airfield probably wasn't too helpful.