I met up with an older electrician yesterday and was reminiscing as old men do !! I was talking of my teenage years in the mid 1950's and helping my father rewire an old property he'd bought - metal fish wires and threading steel conduit were the 'apprentice's' tasks. The guy challenge my memory on the introduction of ring circuits saying that it was well after that they were brought in (another memory of crossing line and neutral in a box and the resulting impressively big bang when the large cast iron fuse box was thrown on!).
I've no doubt that I was correct but can anyone point to when the ring system was introduced.
Rob