Hi. my living room is currently using a long flex extension to feed a corner lamp as the double socket is on other side of the wall , I am going to decorate in a couple of weeks and would like another double socket where the lamp currently is but the only feasible way to do this would be to channel out and run a cable horizontal . this would be not connected to the ring main . I cannot run it vertical as this would be a real pain lifting all the floorboards above but it would also mean damaging/repairing coven which is a about 14inch down and 6inch thick ... any advice would be great