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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 and pipework are in compliance with the safety standards. You should always be working with a Gas Safe registered engineer, and ask to see their Gas Safe ID card before beginning any work. Landlords are required to have an CP12 annual inspection performed on all gas appliances and flues. Find verified and reviewed local