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What Does a Gas Safety Engineer Do? A gas safety certificate, or CP12, is an official file 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 need to perform gas work. They will show you their Gas Safe Register ID card, which has a special licence number. Qualifications If you have a barga