Was speaking to a mate of mine who used to be a sparky before part p etc, and he qas explaining how when rewiring a property he used to drill from the switch straight up and into the ceiling cavity above with a long masonry bit. He has just done it in his new place and although I am very impressed with how quick and mess free it is, I cant help but think it will be violating zoning regs etc. I have been through the BGB and the OSG and cant really find anything.. what are your thoughts?