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What Does a Gas Safety Engineer Do? A gas safety certificate, or CP12, is a main document that shows your gas devices, fittings and flues are safe. It is a legal requirement for landlords to get one for all of their residential or commercial 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 an unique licence number. Credentials If you have a good deal of useful knowledge and a problem-solving nature, then