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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 home appliances, fittings and flues are safe. It is a legal requirement for landlords to get one for all of their homes. Just a Gas Safe Registered (previous CORGI) engineer ought to perform gas work. They will reveal you their Gas Safe Register ID card, which has a special licence number. If you have an excellent deal of useful understanding and an analytical nature, then a task as a Gas Engineer might be perfect for you. You'll work on a