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The Importance of Working With a Gas Engineer It is best to be in the hands of an expert when working with gas. You can be confident that your home is secure, and you are following all laws and regulations. Call National Grid at 0800 111 9999 in case of a suspected emergency. They will cap your gas meter and inform you to contact an engineer. Gas Safety Certificates Gas safety certificates, also known as CP12 certificates, are legal documents that confirm the safe operation o