As a North American, I'm very jealous of the BS1363. I know some people don't like the mandatory ground pin, but it actually serves a really handy purpose. Because the shutter is engaged by the slightly longer ground pin, the shutter just works with minimal resistance.

In the US and Canada, the electrical codes now require tamper resistant receptacles in most residential settings, to stop children from poking metal objects into them. Because the ground pin is optional on plugs that connect to the standard NEMA 5-15R receptacle, you can't use the ground pin as a keying feature like you can with the BS1363. Instead, there is a mechanism that is supposed to only allow a plug to be inserted when both hot and neutral pins are present. It is probably the worst thing ever designed. Sometimes it works fine, a bit of extra pressure and the plug goes right in. But most of the time, it stubbornly binds up and you're left trying to fiddle with the plug to find the perfect combination of pressure and angle that allows the shutter to open. It can be horrendously frustrating.