Thanks for that - I was putting a meter (resistance) across the bare end of neutral and bare end of earth at the wall to get no (litttle) resistance - couple of ohms when I turned the scale to x1.
I am replacing a couple of wall lights. With the mains power off, I get no resistance between the bear earth wire and the neutral wire at the wall; they seem to form a circuit. This strikes me as strange but the old lights worked well and had an earthing point. There is no resistance between the swi...