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The Importance of Working With a Gas Engineer It's best to always employ a professional when working with gas. You can be confident that your property is secure and that you're following all legal regulations. Call National Grid at 0800 111 9999 in the case of an emergency. They will be able to cap your meter and instruct you to call an electrician. Gas Safety Certificates Gas safety certificates (also called CP12 Certificates) are legal documents that confirm
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