You can also use the Gas Safe Register web site to confirm an engineer is on the register. http://nguyenkhuyen-nuithanh.edu.vn/index.php?language=vi&nv=news&nvvithemever=d&nv_redirect=aHR0cHM6Ly9taW5lY3JhZnRjb21tYW5kLnNjaWVuY2UvcHJvZmlsZS9zb3VwbW9vbjIz