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Thanks, however once the earth wires are disconnected from the existing switch they have nothing to connect to. The back box is metal but the new switch is plastic, do they need connecting to something?

I am trying to replace a double dimmer switch which operates four wall lights. The switch I am replacing is metal and is earthed and I am replacing it with a plastic switch. The current switch has two wires coming from the wall each of which have a black and red wire and an earth wire. The red...