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Working With a Gas Safety Engineer Newport Pagnell Gas safety certificates, also known as CP12s are legal documents that verify that your home's gas appliances as well as pipework meet the safety standards. Always collaborate 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 a CP12 annual inspection carried out on all gas appliances and flues. Find reviewed and vetted local tradespeopl