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Blimey. I wish I had you as the on my side in some of the complaints I deal with. If you blame the tiler that quickly without any meaningful inestigation it would make my life much simpler. 😜I'll confirm what's happening underneath now, without the need to lift the floor!
You've cut corners!
You've not used the right materials!
You should always fit a smart thermostat!
You are paying for the new floor!
And no, I'm not harsh?
The word you're looking for is
"correct"!