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I know you did the work yourself, but did you offer them any money for their time? He may say no, but I'd imagine they've lost out on some other work too being +ve.
I had plumber #5 out yesterday looking at why my unvented system was discharging water out the overflow when running. Seeing as the guy who installed it no longer works for the company he worked for when it was fitted, and has now ghosted me. And the owner of the company started making noises about coming to fix it, has also ghosted me. A more experienced guy came round yesterday and replaced a lot of potentially dangerous "fixes" the first guy added when he originally tried to stop the overflow. He removed a non return valve that could have caused the whole thing to go bang and has noticed that there is no extra power to the pump so it shuts off as soon as the boiler stops, instead of continuing to push water around for 4 min. Also added a stopcock to save having to turn all the water off in the street. So far he only charged me for his time, not the additional stop cock valve or random bits of copper he used.
Also, he has been the only one to diagnose a minor issue back to the fault of the Tado control unit. It's always been the case that when you turn the HW on, you get HW only. But if you turn the Heating on, you get Heating and HW together. So I used HW only in the summer, and now Heating only, as it is currently doing both. The previous guys have said that is just how it is. This guy was more, "nah, that's not right". So took the control unit off and proved it by shorting the correct terminals (pretending to be a switch) and showed both HW and Heating coming on independently. So I have a "ticket" open with Tado.
He has to come back and fit a pressure relief valve to hopefully resolve the overflow, and to run a new cable from the pump down to the boiler.
A good news story if you care for it: called my regular plumber because my boiler was leaking and we had to switch it off. Sadly he said he had tested + for COVID so couldn’t help, but he went through some over the phone diagnosis to work out what the problem was. After trying lots of different plumbers, I get a ‘well established, local company’ quoting me £390 to fix, which seems a bit spendy. I check back with my regular plumber, and he orders a new part for me, talks me through the process, and I have fixed the problem for less than £7. Dunno why I’m sharing this except to say: find a good plumber, respect his skills and stick with him