A Gas Safety Certificate (or record) is a document that should be given to you once a gas engineer has finished any gas work at your property such as a service or safety check, and details specifically what has been inspected and any further issues there may be.
It should always include key information such as:
a description of and the location of each appliance or flue checked
the name, registration number and signature of the individual carrying out the check
the date on which the appliance or flue was checked
the address of the property at which the appliance or flue is installed
the name and address of the landlord (or their agent where appropriate)
any safety-related defect identified and any remedial action taken