Embarrassing to recall these things! Not sure how old, but certainly still in single digits.
I was proud to work out that by twisting short lengths of flex around the pins of the plugs I could have both the electric heater and the reading lamp working on the one socket in my bedroom. (These would be 15amp round pin plugs then). I recall my Dad was less impressed, but I think I did get a two way adaptor soon after.
