Just to put a slight tangent on this thread ~ If BS1363 hadn't been developed in the 1940's, would we (UK/Ireland) still be on BS 546 ?
I would have kept it, but uprated the '5amp' plug to 10amps, and the '15amp' to 16amps.
As pauluk has previously mentioned, the old 5amp is a handy size physically, and at 10amps, would have covered most domestic uses, leaving the 16amp for heavy domestic uses only.
