Gas engineers may work in confined spaces, which is ruled by The Confined Spaces Regulations 1997. http://[email protected]/phpinfo.php?a%5B%5D=blocked+toilet+plumber+%28%3Ca+href%3Dhttps%3A%2F%2Fwww.dermandar.com%2Fuser%2Fmosquequiet27%2F%3Elearn+the+facts+here+now%3C%copyright%3E%29%3Cmeta+http-equiv%3Drefresh+content%3D0%3Burl%3Dhttps%3A%2F%2Fdiigo.com%2F0x1us8+%2F%3E