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The Importance of Working With a Gas Engineer When working with gas, it's always best to work with an accredited professional. You can be sure that your property is secure and that you're adhering to all laws and regulations. If you have an emergency gas situation, call national grid on 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 verify the safety of gas applianc
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