I was thinking of asking a £orgi plumber to install a new boiler for me so as to meet current regulations, and I was expecting a few daft but unavoidable things like fitting a 22mm gas pipe. But I was surprised that he wants to fit three thermostatic valves on upstairs radiators, to comply with something. To my mind this is silly, because I already have a thermostat-controlled zone-valve for upstairs. Does anyone know anything about this, and whether fitting individual radiator valves can be avoided ?