I am trying to workout what way to install a light fitting and switch in the attic. There seems to be a single core cable running between the existing light fittings above the ceiling. I was told this is the way builders are installing circuits now i.e 1 single neutral cable between the fittings. Can I cut into this and where can I get the live from. If its from the switch, how is it wired ?? I want to fit the switch just inside the loft door. Could somebody please give me a simple explanation with maybe even a diagram !!