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Just to clarify though, you could have damp in the walls or under a floor that has destroyed the insulation of the cables over time and that can be tested with an insulation resistance tester once the problem circuit and part of the circuit is diagnosed. I had one of those recently tripping the ring in a basement flat. In this case the tell tale sign was rusty backboxes.
Airhead
iamalex
Thanks, again! Yes, idiot mistake, there was another switch in the box that controlled a group that I could see in the dark. House sockets are on a different group so that’s peculiar.