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A few pics would help

Ah just re read your post didnt realise you were being sarcastic, well i still think they are great.

Great little product Jon, where might i get my hands on some of these? I can imagine these will come in real handy for boiler swaps.

I think you would struggle to prove it if im honest. He seems the sort of person who will try anything to worm out of it. Most tradesmen make mistakes from time to time, but only the good ones admit to it.

Did the entire valve come off the pipe? Or did trv head alone come off? If the latter then if its a cheap one the plastic becomes brittle and could possibly become detached, this would then release the pin allowing the water to gush out. Or maybe the plasterer knocked it. if the entire valve...

Where there's a will there's a way! It is possible to solder with a bit of water still in pipe but depends on pipe size etc. but you may as well just fully drain. Is this in your house?

Eh. Plumb centre stock them hooting. Although not used very often, when you need them they are quite handy.

Yes open bleed points. Yes most merchants sell them. When i have been stuck for one in the past i just get the file out, and file the stop in the middle of the socket.

Yes i would fully drain down if soldering. If i were stuck for time i would just relieve the pressure and use a compression fitting.

Powerflushing is as easy as it comes, but very very boring. I usually try catch up with paperwork etc, while Powerflushing.

Ptfe is fine.

Bleed all rads via bleed tap on side or back of each rad. Start downstairs work your way up. Keep topping the pressure up when it falls

Sounds likes you still have a lot of air in the system keep bleeding the rads get as much air out as you can.

After draining your system to do the alterations did you re fill the system via a filling loop? If not you need to find it, usually under boiler

Would need to see a picture of the filling loop

Try plumbers merchants, ask the staff to keep your number behind the counter.

Did you fill it back up again once drained? Maybe the pressure gauge is giving a false reading if system is dirty.

Good luck Mike.

Well done thanks for the update

O rings can stick after a time i find twisting slightly and pulling at the same time.