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Thanks for replies. Like I said it's not my house, just doing 'the leg work'. Gonna look into the nylon screw option. (BTW cables are double insulated and in good condition from what I saw :) )

Looking for a little help, a family member who is selling a house has been told that most of the light switches have no earth. These are metal back boxes, plastic face plates and of course metal screws. The switches are wired using singles, but not in conduit, so running an earth cable would...