That's the one. But is that part of BS 546? It has no earth pin...
Good point. I've never actually read the whole of BS546. Does it make any reference to 2-pin connectors, either directly or by including a reference to an earlier British Standard? I'm not sure.
Thinking about it though, and confirmed with a quick rummage through my spares box, none of the 2-pin 5-amp plugs made during the 1950s/60/70s era seem to be marked with any sort of BS number.
