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Working With a Gas Safety Engineer Newport Pagnell Gas safety certificates, also known as CP12s, are legal documents that prove that your home's gas appliances as well as pipework are in compliance with the safety standards. Gas Safe registered engineers should be employed for all work. Ask to see their Gas Safe ID before they begin. Landlords must have a CP12 inspection on all their flues and gas appliances each year. Find verified and reviewed local tradespeople online. Safety