I was chasing out a wall for a ring main socket and set in the plaster is a wire runnning vertically. It's a bare wound wire, best described as like a bike brake or gear wire and quite taut. The wall was originally an outside wall, with kitchen extension now added, with plaster about 20mm deep and the wire is above a current electric socket but I'm not sure that's relevant. I chased out the same wall on the other side of the room and didn't see anything similar although obviously I'm only exposing about the width of the socket box. Anyone have any idea why this would be there ?

