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I have bought a new ceiling rose for a light. The wires in it are UK pre-2004. There's one black, two red, one yellow, one blue, and two green and yellow earth. Where do all these go on the ceiling rose?

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    Are you replacing an existing fixture? If so, connect the new fixture just as the old one was. Did the new fixture come with any documentation? If so, follow the instructions provided by the manufacturer. – Tester101 Apr 14 '14 at 9:13
  • Can you add a photo of the wiring in the ceiling and in the rose. – ChrisF Apr 30 '14 at 8:43
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Often, electricians used ordinary black/red/green twin&earth for C but marked the black wire with red tape (to indicate "switched live")

You seem to have something nonstandard, perhaps a spur (therefore missing B) without an earth to the switch? You'll have to use appropriate methods to determine what is what.

See answer to similar old question https://diy.stackexchange.com/a/32251/2815

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