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Working With a Gas Safety Engineer Newport Pagnell Gas safety certificates (CP12s) are legal documents that confirm your home's gas appliances, pipework, and other safety standards. You should always be working with an Gas Safe registered engineer, and request to see their Gas Safe ID card before letting them start any work. Landlords must undergo a CP12 inspection of all their gas appliances and flues every year. Find local tradespeople who have been verified and reviewed online. Safety First When working with