WHBM and treadigraph:
Yes he was at Witley. Then they (ASRE or whatever it was called at the time) moved down to Portsdown Hill and then he "changed jobs" in the 1960s and went to Oceanography which was back at Witley. Now Oceanography is in Southampton and King Edwards has the building back. I have a recording he made of a nightingale that used to sing in the woods there.
The valves were mentioned during our tour and they were surprised that we knew about them. I had loads to get rid of when Dad died. Can't remember where they went but I know I didn't chuck them. I still use a Quad 303 amp.
Unfortunately, as somebody I knew in my childhood has said, "Daddy went to work and Daddy came home. We never knew what he did in between". So much social history has been lost due to the Official Secrets.