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What Does a Gas Safety Engineer Do? A gas safety certificate, or CP12, is an official document that shows your gas appliances, fittings and flues are safe. It is a legal requirement for landlords to get one for all of their properties. Only a Gas Safe Registered (previous CORGI) engineer should perform gas work. They will reveal you their Gas Safe Register ID card, which has a distinct licence number. Credentials If you have a bargain of useful understanding and an