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Hard to tell, not something I've seen before that I recall. You could try your suggestion, but may have to renew it, as not all are demountable.

Try some heat, maybe carefully use a bit of boiled kettle water?

Yep, as @Harry Bloomfield it's slightly acidic and will eat away at most things over time, exactly the reason it must not be metal Neither is the white pipe, has to be insulated through the wall now

If it's hard wired then to relocate will likely need to be a wireless type. Is there a radiator in the hallway? Regards who does the job can be either, just needs to be someone with a clue about wiring.

Several Vaillant boilers including the ecofit

Screenshot taken from the mi's, steps 2 and 4 should answer this

Sorry should have said, yes manufacturers instructions I can't remember tbh, there was a gas safe technical bulletin regarding being sealed to the building fabric. I'll try and find out. It should have a weather collar though and still doesn't negate the fact of the hole.

If it’s not sealed inside or out, then no it doesn’t. Should be sealed to the building fabric, but mi’s will stipulate what they want. Any opening to the building, such as an air vent, ventilation, holes et al. The flue should be 25mm away, might be more from the soffits, again would be in the...

Correct Both could have been used, but they still have to get 2 in the neutral, and that L is often used to bridge to A if required

Yes it does because it's an opening in the building, so similar to an air vent, most mi's I've read state 300mm away, which that clearly isn't. There’s no sealing around the outside if the flue and no weather collar. Also the flue could be considered too close to the eaves and eaves ventilation...

You could keep the mechanical clock and just install a wireless thermostat as well.

Yes or at least at the branch if not practicable

You asked for copper, it was agreed and now they're backtracking with pitiful excuses imo. Also as mentioned you don't want read legs if that's what they are (the ones with stop ends)

According to the installation instructions it should fit onto an industry standard wallplate, so should clip on. No wiring alterations necessary Earth wire is correct in the earth parking terminal.

If there's a link where the opentherm connections should be then yes remove the link

We don't have any confirmation that there's any zone valves as it appears to be a combi, so unless @Glyn1959 can give us more than it worked fine before then we're at a loss

Have you considered lifting the pipe up higher to solder it or is there still too much water?

Surely people haven't gone through life without learning a thing or 2. For example, TV programmes such as Watchdog et al tell you to obtain more than 1 quote. I feel sorry for people who have committed to expenditure upfront and then trade has done a runner or whatever. People are entitled to a...

Don't know tbh, but I'd be inclined to agree

Apart from the pressure (which you say is ok) the there's not much more you can do. Could be a multitude of issues