What year did you visit A shed? If it was 1979 it might have been ME! There wasn't many of us and I did show a few space cadets around in my time!! Once we eaven had a Dutch ATC group visit us. They wouldn't have got passed the security now.
It is a shame that the good old apprenticship schemes have all but died out. I still remember and use some of the old tricks that my apprentice masters (Reg Weeding and Doug Beckford ) taught me.
Rgds Dr I