Oddly enough, We did get a variation on the round pin theme here in NZ. It was called the 5A Clock plug. I'm still searching for a decent picture of one and I think that HPM still has a plug/socket arrangement like this. The socket was recessed into the wall (to fit behind a clock) and the plug fitted into the recessed socket. They were 3-pin, but most clocks of the era were only fed with 2-core Tru-rip.
