Whilst there's no specified minimum height the sockets should be high enough to all the floor to be mopped without them getting wet.

You don't need trunking uder the floor if you're using cable, you can just clip it direct to the joists etc.

Quote Originally Posted by julies View Post
4) or Can I use ready made electrical extension cord and run along the side of the skirting, and use the one side of the extension, to plug into an existing socket in the room, and then other side of the extension, I strip off the plug and then wire and connect into a new outlet that's mounted on the outside of the skirting. Would this be seen as an external extension and not an installation but still has earth leakage protection.
Kinda a grey area, extension chords should not really secured and never ever fit a plug on both ends to supply a socket, always wire into the back of the socket.