Non Standard Plugs and Sockets - MK
Probably the most commonly used modern type, this has a T shape earth pin.
As with most of the non standard types, this has a modified earth pin, line and neutral unchanged. The earth pin on this style is T shaped, making it totally imcompatible with normal sockets.
These plugs and sockets are modern ones, and are probably the most commonly used non-standard type.
Note the blue and brown coloured plastic inserts below each pin, to identify which colour of wire connects to each pin.
The single socket here is a metal version, however many styles are available including plain white plastic.
The back of the plug has a printed warning advising to use only with the appropriate socket - attempting to shove this plug into a standard socket outlet will damage the socket.
GET branded socket
A double white plastic socket, GET branded. Although a different manufacturer, the design is identical to the MK ones, and MK plugs fit into this socket.