Corgi won't do you much good since its not the government approved body anymore. They need to be GasSafe registered now. Just a diversion of where money has to be paid and by all accounts just as useless as Corgi if anything is actually substandard or should be condemned.
Or Try Andy Mawson based in Cottingley 07971-597-567, very reliable did my bathroom complete, under floor heating, full tiling, and appliances. He also is qualified for gas.
