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The Importance of Working With a Gas Engineer When working using gas, it's best to hire an accredited professional. You can be confident that your home is secure and that you're adhering to all laws and regulations. In the event of an emergency gas situation Call national grid at 0800 111 9999. They will shut off your gas meter and advise you to call an engineer. Gas Safety Certificates Gas safety certificates, also known as CP12 certificates are legal documents that prove the safety of gas appliances a