I would say connect the earths to the metal switch plates, but given that the previous owner was an idiot you have no guarantee that the earth is continuous. Or that it really is an earth.
Replace the metal switches with plastic ones.
If its directly connected to the 2 way switch what does this mean.
No, it is the yellow of a pre-harmonised three-core and earth cable being used. That said, the cores are not correctly identified, as all of them should have been sleeved red (nowadays brown) to indicate that they are phase (now line) conductors.
Hey guys all sorted. Previous owner just muddled some of the wires up as they wernt properly colour coded. And it was just the 2 switches pictured that were not earthed but electrician said it was fine as the wires were secure but they are all earthed now. Thanks for your help guys
. Not that they were fine, just that they were secure so would of been unlikely to get a shock but he earthed everything anyway and sorted out the wiring problem in about half an hour.
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