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What your talking about are totally different things, an annual gas check would be something that is required by law for a rental property. You're talking about a boiler service and filling in the log book, totally different things.
Bolier warrantys argent worth the paper they are wrote in, depending on the engineer that comes out they are using all sorts to get out of not repairing stuff now and some of it is fuckin stupid.
You dont need a annual gas cert in a private property though so why would people spend £100 a year on that. So I think thats ridiculous.