Highriser has sabotaged the best efforts of Australia's electrical safety regulators. This is only to accommodate R's laptop charger when we are in Japan. It is not a wise idea to use an high current device that has an earth prong in an unearthed socket.
R was telling me that when he was a kid growing up in England, there were so many different types of plugs and sockets, that appliances did not have plugs on them when they were new. You chose a plug to suit your house and the plug was fitted at the shop. His mother used to plug the clothes iron into the light socket.