I recall my dad rented a small farm house cottage in Cornwall some years ago. Despite being 1986 the whole house still had it's BS546 round pin sockets. This limited the number of things that could be plugged in due to the lack of adaptors to convert to square pin sockets. To put this in context the current BS1363 square pin plug system was introduced in 1947 so this house was monstrously out of date.
Slightly off topic but recalled partly due to your comment, and partly because I'm partial to a pint of Korev too.