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Why Landlords Should Keep Their Gas Safety Certificates Up to Date Landlords are responsible for making sure that all gas appliances are in compliance with the rules and regulations and are safe. Failure to do so could result in penalties and could compromise the safety of tenants. CP12 is the abbreviation for CORGI Form 12. Also known as a Gas Safety Certificate, or Landlord's Gas Safety Record. It is legally required to have your gas pipework as well as appliances and flues test