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What Does a Gas Safety Engineer Do? , or CP12, is a main document that shows your gas home 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 must perform gas work. They will show you their Gas Safe Register ID card, which has a special licence number. Credentials If you have a great offer of useful kn