I have just purchased a house which is about 15 years old. No problem with the electrics but want to change light switches and plug sockets over to metal from plastic. I have managed to change the single plug sockets over as they did not need to be earthed as per the instructions. However when I came to change the double plug sockets and light switches they require to be earthed to the back box. Is this just a case of buying some earthing cable (green & yellow casing) and earthing switch plate to back box? Also I want to change light switch to a dimmer switch which also requires earthing. Any help would be appreciated as had a quote from an electrician who wanted £15 per socket to change over and thought that was a bit extortionate??
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