The light switch in my loft has 2 2 core wires going to it. The red wire of each go to each side of the switch. The 2 black wires are twisted together at the point where the insulation has been removed. These are not attached to any part of the switch. Has someone used one of the red wires as a black one. I can't find where these wires come from.
Thanks for any help.
Thanks for any help.