Is it time to conduct gas safety testing? METRO PAT FM LTD does not currently provide gas safety testing or certification. If you require a gas safety check or CP12 certificate, arrange the work with a Gas Safe registered engineer. With all of the gas appliances in the average home, it's no surprise that gas safety testing is required by law. When it comes to gas appliances and fixtures, safety is always a significant concern, so having gas safety testing and certification pe