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Extend the ring but do it in the backbox, don't splice into a cable under the floor or in the wall. If you are going to run a cable for the spur it's almost as easy to run 2, then you attach one cable to one side of the loop and the other to the other side in the original backbox. Only one side of the loop will be connected in the socket, the other will be in wagos in the backbox. This way if you ever have a problem with the loop you don't need to worry about a connection under a floor.
Airhead
New socket question. There is currently a double socket on one side of our hallway. I am fairly sure it's not already a spur (hope to confirm when I come to replace it). If it is on the ring, I'd like to spur off that to put another double socket on the other side of the hall where the furniture actually is for a lamp and things.
Question is, would it be better to just spur off the existing, or if I'm going under the floor anyway and can see the cable going to it, break into that and extend the ring to incorporate the new socket using wagos and boxes.