just removed boxing from downstairs cloakroom ceiling that was covering old heating duct and found hole in ceiling. Looks like they installed the light and then moved it when the house was built. You can see that the outer sheath of the cable has been removed and, having looked under the upstairs floorboards, I can see the cables run under the joist. I need to get the ceiling repaired but the plasterer is not happy going over the cable. I was thinking that I would replace the light fitting and switch with new ones and rewire them so the cables are no longer under the joist. I just wondered how the cables should be run. Should i drill a couple of holes through the joist and run them through or should I cut a notch out the top of the joist just under the floorboards (like the heating pipes). I was thinking that drilling would be best but would appreciate advice from the professionals on whether this is correct. Many thanks.