Seems like the 3 core and earth cable at the light fitting is not the same cable that appears at the switch ,so there must be a junction box somewhere. I think the blue cable at the light fitting is a neutral and should connect with the other neutrals at the light fitting ,put it in the same terminal with the black wire.
Seems like the 3 core and earth cable at the light fitting is not the same cable that appears at the switch ,so there must be a junction box somewhere. I think the blue cable at the light fitting is a neutral and should connect with the other neutrals at the light fitting ,put it in the same terminal with the black wire.
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