All Gas Safe registered engineers will have a listing of the work they are certified to hold out on the back of their Gas Safe copyright. https://gi46j3mwwk5m5fmr45wwo6ctp2c6mbpl7xj7uxpbuu4ma6zaqp4q.cdn.ampproject.org/c/ezproxy.cityu.edu.hk%2Flogin%3Furl%3Dhttps%3A%2F%2Fbermondseyplumber.co.uk