I d be happy to sign off work that has been done by someone else as long as I could see the whole installation...
You won’t be able to check the whole installation without ripping the gas pipework off the wall!!!
Please tell me this, you have a nice house, pretty wife and pretty kids… Are you saying you let some mug into your house to install a gas boiler and then some other mug to sing it off!? YES or NO?
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