What Does a Gas Safety Engineer Do? A gas safety certificate, or CP12, is a main file that proves your gas appliances, fittings and flues are safe. It is a legal requirement for landlords to get one for all of their residential or commercial properties. <img width="430" src="https://www.mkgassafety.co.uk/wp-content/uploads/2024/09/blue-gas-flames-2023-11-27-05-01-31-utc-min-sca
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