Landlord Inspection = an inspection of Appliances to ensure that flues and ventilation are effective, that the appliances are burning the correct amount of fuel, the safety devices work
and that the gas installation is gas tight and that a electrical earth bond is correctly fitted there is no pass or fail - just a report, however if there are serious problems these will be listed on an Advice/Warning notice and depending on the severity part of OR the whole installation may be disconnected.
Not required by law on a CP12, but always advisable
Service = A dismantling cleaning and checking of appliance components as listed in the manufacturers requirements for maintenance also a Flue gas Analyser is used to check the products of combustion and allow the engineer to trim the combustion settings if required