I was a Valley in early/mid eighties and flew from mona a few times in light aircraft, and we went there working on Hawks a few times when there were problems at Valley.
I seem to recall going in the main gate, and there being one large scruffy hangar, an air traffic tower (?), and a couple of other smaller buildings.
We had a couple of Hawk have ‘incidents’ there one crashing after hitting birds (xx180), and another doing a wheels up landing after the pilot cocked up….he then ejected after the aircraft came to rest!.
I also recall several near misses when lorries went through the traffic lights on the A5, and approaching aircraft having to pull up to avoid them.