How the Holy Hell did they generate that? I mean, the UK has had more than enough competing designs over the years (some more dangerous than others), but that one's a physical impossibility.
https://en.wikipedia.org/wiki/AC_power_plugs_and_sockets:_British_and_related_types
I've used most of those, over the years, plus the bizarre one with standard earth pin, one round pin and one rectangular (rotated 45 degrees) with fuses for both small pins (Bi-phase 240V centre-tapped to Earth!) That one was at Dunlop, and now gone. (Thank the Gods.)