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No earth at all, just the red and black wires, the meter was a B&Q one that you put to the wire and push a button to test for live.

I have a mains voltage tester, looking at it again the number was quite long and started with 12 I gues I should read the last three where it says 220?

I have a light in the hall that was controlled by a switch there and on the upstairs landing. The switches were old bakerlite ones with black and red wiring, they were swapped for new ones but now the light only works when the upstairs switch is in the on position whereas it used to work both...