I live in Croatia but own a small cottage in Scotland that I rent out. My Landlord Registration is due for renewal soon and I have to provide various documents including an electrical safety report. I got an electrician to inspect the property but he has found various defects. His estimate for rectifying these is £1650 including VAT. A big chunk of that is for renewing 3 consumer units. There is one for the main house, one in the garage and one in an attached outbuilding which houses the gas boiler. The one in the garage is a purpose made Screwfix garage CU with RCD and MCBs for lights and sockets. He says that should have a metal enclosure and the RCD and MCBs should be the same make (one MCB is Volex, I think the rest is Protek). The other 2 are older and I think are still fuseboxes, with no RCD. He says RCD protection is required because of regulation 522.6.202/203. This regulation concerns cables behind plaster, panelling or whatever. Has this regulation been applied retrospectively, to old installations? If so, it implies that every home with no RCD protection is deemed unsatisfactory.