Thanks to eveyone for the suggestions and to EFLImpudence for clarifying that it being a black wire doesn't necessarily mean it's neutral. I'm learning a lot on this site. There is a ground in the other part of the fixture. Will replicate the original wiring and see how the plaster and rawl...
The pull switch failed in our downstairs bathroom that switches the light and extraction fan on and off. The original is a 2 way, but L2 is just an empty space. I bought a replacement crabtree 2way, which came with a variety of helpful wiring diagrams. Nothing like the original though. Com wired...