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If the 'switch/line' in the diagram is one Twin and Earth and is the original wire from the original fitting then it may well be line in (which would go to COM), and switched line out which would go into L1 with all the other lines for that 'side'.Yes sorry the each line is a whole T&E, new cables were connected with the old through connector blocks I believe I can't rip the ceiling off as it has been already plastered. So I believe each COM is a fitting ? however from one side there are only 3 T&E sticking..
You think that from each side I am suppose to wire those 'switch/lines' into the each COM on the backplate ? and have to keep doing a trial & error on each COM T&E cable where they go in L1 ? or connect all neutrals together and all lives in a Wago connector?
It might seem so simple but who labelled all these twin and earths just made a complete headache as to do guess work. Sorry and thanks for your reply !
Usually brown or Red will be permanent live and blue/black switched live (should be sheathed to indicate it's a switched live) but it's not guaranteed that it's that way round.
If it is like that, the issue may be whether you have a neutral at the switch at all and you'll have to test for that. (Hopefully any currently live wires are suitably terminated at the moment!)
If the new fittings are all being fed only from the switch then you'll need to have an incoming neutral from somewhere, which will go into a block with all the other neutrals.
You may need to check wiring at each fitting and connect the ends with a wago (all with no power of course!) and then check continuity at the switch to identify what each cable does. It's often quicker in the long run to do that, especially if the labelling hasn't been left clear for you.
I do hope it's a big backbox, that seems like a lot of cables for behind a 1 gang switch!