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The Importance of Working With a Gas Engineer When working with gas, it's best to work with an authorized professional. This way, you'll be certain that your property is secure and that you're following the legal guidelines. In the event of an emergency gas situation If you suspect a gas emergency, contact national grid at 0800 111 9999. They will stop your meter and tell you to call an electrician. Gas Safety Certificates Gas safety certificates (also called CP12 Certificate