yesterday got a phone call from my brother in law asking what is an rcd. It turns out he has a service contract with British gas for his tumble Drier and microwave. The engineer came to service the drier and told him that he needed to see his consumer unit, as they had to check to see if the circuit was on an rcd at all customers premisies , otherwise they may no longer be able to cover the appliance.He hasnt got an rcd so the gas man told him to get an electrician to fit one or he may not be covered.I told him that an rcd is for personal protection and does not affect the workings of the appliances and he is going to get back to them.What a nerve . It seems they are told to check this at every job by British gas, and to tell the customer they must have a trip fitted.