Hi, Newcomer to the forum and self confessed know-nothing here. I've just had an unvented cylinder replaced - see attachment. It's for a rental property meaning I've been sorting out from afar and was assured by the plumber that he is G3 qualified, but as the conversation has developed I have become increasingly convinced that he isn't. My priority is to establish that the install is safe - if anyone knowledgeable could look at the photo and give their expert opinion I'd be very grateful. Secondly, it looks like I'll need to speak to LABC myself? Any idea what the charge for them certifying it would be? As I say, that's a secondary concern to the immediate safety of the thing.