As you have cables going to it and coming back it's part of the ring. A spur would be just L N & E running to a socket/fused spur. But your logic is correct, as long as that 'spur' socket doesn't have any other connections in it. It looks like singles in conduit, might be worth labelling them before you start.
As you have cables going to it and coming back it's part of the ring. A spur would be just L N & E running to a socket/fused spur. But your logic is correct, as long as that 'spur' socket doesn't have any other connections in it. It looks like singles in conduit, might be worth labelling them before you start.