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Working With a Gas Safety Engineer Newport Pagnell Gas safety certificates (CP12s) are legal documents that prove your home's gas appliances, pipework, and other safety standards. Always work with a Gas Safe registered engineer, and ask for their Gas Safe ID card before they can begin any work. Landlords are required to be able to have an CP12 annual inspection performed on all gas appliances and flues. Find local tradespeople that have been vetted and reviewed online. Safety First When i