Light wiring help

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Hi DIY project, fitting a new ceiling light but struggling with the wiring.

I get the existing 2 x blue neutral wires go together into the connector block opposite the neutral wire of the new light.

The earth goes into the connector block opposite the earth of the new light.

But the brown, red and black wires confuse me….. the existing red is live, as are the existing brown - but the black is old
Neutral? And is connected to the two existing brown wires in the ceiling connector?
 

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Two blues Neutral. Loop in and Loop out
Two Browns Live Loop in and Loop out
Black Live to switch
Red Switched Live from switch
 
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Also note it doesn't look like your switch drop has an earth (no no metal switches should be used). It would appear that it was an old unearthed lighting circuit (this I'm guessing is an early to mid 1960s property?) , which has had the feeds re-wired semi recently but the switch drop has been left to avoid chasing out the wall
 
Two blues Neutral. Loop in and Loop out
Two Browns Live Loop in and Loop out
Black Live to switch
Red Switched Live from switch
Just to clarify for the op - the red and black wires in your rose would normally be reversed.

(Yours has been wired so the black is permanent live and red is switched live - just so you know.)
 
Thank you, I’ve still really no clue how to connect the brown/red/black wires. Gonna get someone in lol
 
The blues should be connected together, the 2 brown and the black in the middle should be connected together and the red on the left should be connected to the new switched live on your fitting.
 
Does this look right?
 

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Yes the wiring connections are correct. The grey outer sheath of all cables should come into the enclosure ,some are a bit short.
 

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