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The Importance of Working With a Gas Engineer When working using gas, it's recommended to work with a registered professional. You can be confident that your home is secure 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 meter and advise you to contact an electrician. Gas Safety Certificates Gas safety certificates, also known as CP12 certificates are legal documents that verify the safety of gas appliances and f