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Hi , i am doing my gas portfolio with a prominent company, having been out with one of there gas engineers to do a landlord cert CP12 on a combi boiler , i was told by him that a gas rate or operating pressure need NOT to be taken as a CPA is all that was needed , but in the GSR 26 . 9 ( 9 ) it says , where a person performs "work" on a gas appliance he shall immediately thereafter examine , its operating pressure or heat input or , where necessary both; is doing a landlord cert on a combi classed as "work" under GSR ? i take it , it is .