Hi, im having to move a twin wall socket due to its position and need to move it along the wall, but ive found the cable to short to allow me to do this, the socket is on a partion wall ie hollow plaster board the feed comes from the loft as its a bungalow, but rather than having to pull the feed back uup and re-fed is it allowed or even possible saftley to add a futher length to the existing feed so that i can move the new socket, if so what is the best solution as once this done it will be within the wall forever