Absolute detest people like this. I'd report him to 'Gas Safe', if he's incompetent wiring in a Hive he's probably shoddy when working on Gas appliances and a danger to others !
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He has served our boiler a few times and we trusted him but you are probably right. Husband said the hive was actually fairly simple really. I think it was more a case of him rushing rather than being incompetent. He won’t be back in any case.