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And so the mystery goes on... So, I did as was suggested - I removed and isolated the red that went into 1 way B, and isolated the neutral from that cable as well. Low and behold the switch doesn't work! Checking I hadn't done anything stupid, I replaced the cables as before, and the...

Cheers. Having thought about that one, I realised that would be a bit stupid! Fair point about isolating the neutral from that cable as well. Thanks for your help.

Thanks - so I should terminate that one red with the other neutrals? Can you think of a reason why the wire would be there if it doesn't do anything - could it be in another part of the circuit?

Hi, I had another look, and it appears I did get it slightly wrong - sorry! To clarify: 2 reds come into 1 Way A 1 red comes into Com B (which is on the same side of the switch as 1 Way A) Another independent red connects Com B and Com A 1 red goes into 1 way B. I've taken a...

Hi, any help on the following would be greatly appreciated... My lounge has two lights in it. It currently has a 2-gang switch, but one switch turns both lights on and off. The other does nothing (as far as I can tell!) I have bought a dimmer to replace the current switch. Since only 1...