I have a 3 phase supply to my 1957 architect designed grade II listed house. I have just built an annexe to the property and want to run a supply from one of the unused phases. My supplier says: 'we don't do that sort of thing' and Western Power says: ' ask your supplier.' No independent electrician will do this as I understand they are not sanctioned to work on the equipment without permission from these companies. We have tried other suppliers (Utility Warehouse/Octopuss/Scottish Power/ NPower etc) Does anyone out there know how I untangle this web of nonsense? It's been ongoing for about 10 months now.