If there is another wall between the old socket and the new (two right angles) you could still do it by fitting a socket on the middle wall (to show that there is a cable there).
Plus, don't forget you can go up at the corners (within 1500mm.) so you new sockets can be at a height you want.
He would then have a spur off a spur and it's 150mm, not 1500mm.
150mm - typoo.
Thanks.But, I'll let you off because I know what you mean!