[bionicmerlin]

When I was an apprentice in about 1980 we used to do electrical work in a old people’s home. It had 15A and 5A sockets all over the place and no 13A sockets at all.
My boss said to me it’s only been rewired 7 years ago so that would make it 1973
I think the reason was the old people moving in were more likely to have round pin plugs on their appliances. By 1980 it was a major pain as most people moving in had 13A plugs on their things.
I have been collecting since I was a kid and when I was an apprentice one of my jobs was changing round pin plugs for square on appliances after houses had been rewired .
Hence a major boost to my collection. Andy