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I have a load of 150mm HD polystyrene insulation board left over from a project. I want to insulate my loft at ceiling joist level and floor it out for storage. Somewhere in my head I think PVC Twin & Earth don't mix. Is this due to a reaction between the pvc and poly or does the cable...

I have been given two swan neck type external light fittings that I would like to use to replace two old fittings I have. They are JCC Saxon Range. The wiring diagram shows standard twin and earth set up but the light fittings have three white and one blue wire connected to the compact...