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The Importance of Working With a Gas Engineer When working with gas, it's best to hire an accredited professional. This way, you can ensure that your home is secure and that you're following the legal guidelines. Call National Grid at 0800 111 9999 in case of an emergency. They will stop your meter and tell you to contact an electrician. Gas Safety Certificates Gas safety certificates, also referred to as CP12 certificates, are legal documents that confirm the
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