Looking for some help.

Will have another go tomorrow. It’s fried my brain tonight. Thanks for the input. Will hopefully get to the bottom of it.
 
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Suspect I was wrong.
Do you have 3 lights ? Is that why there are so many cables in the box. ?
 
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On the main junction box, remove the red & brown (flex) from the top of the connector & connect them into a separate connector. Keep the other two cables connected together. ISOLATE ELECTRICITY FIRST. Whoever installed this has not identified the neutral & earth conductors nor glanded the SWA correctly.
 
On the main junction box, remove the red & brown (flex) from the top of the connector & connect them into a separate connector. Keep the other two cables connected together. ISOLATE ELECTRICITY FIRST. Whoever installed this has not identified the neutral & earth conductors nor glanded the SWA correctly.

I couldn't make out which red wire was from which cable hence I suggested identifying the cable from the PIR black wire. The neutral is largely irrelevant as they are looped in the main junction box - just the live needs to be separated

The long and short of it is that the PIR wire (black) is putting a short between L and N when the PIR operates - there should be a load connected to the PIR wire
 
Thank you everyone for your time and help. I can’t tell you how grateful I am :)
I have now connected a different sensor with a logical wiring format. It all now works. Horrah!
It’s possible the previous sensor in question was faulty. I got there in the end.
 

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