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:) thanks, what a quick reply. yes, we did switch off CU and remove all fuse cartridges (70s box, needs modernising) Then, the light didnt work. But the noise remained: quiet, high pitched. There is no alarm etc nearby, that we know of. I do know this sounds a bit silly so appreciate the...

Hello and thanks in advance for anyone who can provide advice. Sorry if its a bit long winded. One of our light switches started making a low buzzing/humming noise. The switch is a standard, white plastic, one way. (Not a dimmer switch). The buzzing was first noticed yesterday, when the light...