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The Importance of Working With a Gas Engineer When working using gas, it's best to hire a registered professional. You can be sure that your home is secure, and you are following all legal regulations. In the event of an emergency gas situation, call national grid on 0800 111 9999. They will cap your meter and advise you to call an electrician. Gas Safety Certificates Gas safety certificates, also referred to as CP12 certificates, are legal documents that verify the safe operation of gas appliances and flues used in residential propertie