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Working With a Gas Safety Engineer Newport Pagnell Gas safety certificates, or CP12s are legal documents that prove that your home's gas appliances as well as pipework meet the safety standards. Gas Safe registered engineers should be used for all work. Ask to see their Gas Safe ID before they begin. Landlords must undergo a CP12 inspection of all their gas appliances and flues each year. Find local tradespeople who have been vetted and screened online. Safety First If you wor