Used to snoop around there as a kid in the late 50's. It was a Fire Training School as I recollect. I certainly remember a Comet 1 fuselage being there and a Lincoln(?) on the fire dump. I had a gun panel from a Seafire (also on the dump) in my possession until a few years ago.
There was a Flying Club based there with (I think) a Tipsy Belfair and an Auster. There may have been a Tiggy too. I remember flying with the late NMW in Handley Page with him saying that he was a student pilot in those days at Pengam Moors. I have tried to find it on MultiMap but failed - must have been totally buried under all the new stuff.
The thread brought back some very pleasant memories of my aviation roots boyo!