Think of your strappers as a metallic path from you first 2 way switch to the other, the intermediate in the middle or as many as needed, your common wire has to be a dedicated wire from end to end.
Just a few pointers now have a go and draw it up.
IMO regarding these reports, its all about observation with what you are seeing with your eyes ( very good tool) If the installation on the whole is looking good any sockets you take off, light switches, drop any light fittings etc all fine then no need to take every single one off. Its called...
I keep looking at the picture and it looks like 2L1, even with the wiring configuration N's connected together in back box ? Perm Live in Common S/L out ? But hey am not there if you say 3core okay.
Silly question I take it the light/ lights dont work?
Could be a 3L1 disc but have only potted 2core
I think the tester was quite lenient, class 1 fitting on a lighting circuit with no cpc would be a C2 . Even if you changed to class 2 it would still attract C3 All lighting circuits should be earthed.
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