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The Importance of Working With a Gas Engineer It's best to always be in the hands of a professional when working with gas. You can be confident that your property is safe and that you're following all regulations that are legal. Call national grid at 0800 111 9999 in case of a suspected emergency. They will cap your gas meter and inform you to call an engineer. Gas Safety Certificates Gas safety certificates (also known as CP12 Certificates) are legal documents that verify the safe operation of gas appliances in residential pro