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Isolate the flow valve and see if it stays on. Possibly crossed pipework?

This makes no sense to me

Yes, isolate the water, and flush the cistern. Gloves recommended as rubber deterioration can temporarily stain skin. Siamp valve Undo the nut by turning anti clockwise and pull away from valve. Remove failed washer and replace with the new washer, iirc there’s a notch in the seating and a...

Relatively easy. You already know how to turn the water off. If you post a photo of isolation valve I’m sure we can guide you. Probably a compression type, so may even be a case of straight swapping.

Why not currently just change the isolation valve then tackle the tap?

What pump was fitted and if speed control, what speed is it on? Might be worth checking the motorised valve too.

I don't see any reason why not. As long as it has 230v or 24v connections (vast majority, if not all do) then it'll be fine.

With demand calling, From the programmer to the room stat to the brown of the motorised valve should be 230/240vac between live and earth (so you’re testing correctly). This voltage should remain the same until demand has stopped.

Couple of options: use a small slotted screwdriver and hammer on the rusty parts, or gently pull and wiggle the cistern off. If there’s any silicone sealant on it, that could be holding it on too.

Can you post a photo of the fixings in question?

This is incorrect. What are you measuring against? Can you provide photos of the wiring?

Are all wires/connections tight? If it doesn’t move with the head fitted, then I’d say it’s likely the valve giving too much resistance.

It can be yes

I haven’t used those kits, but surely it’s better to use a 3 or 4 inch screw?

Normally sufficient yes

Could be bit opening properly or as you say just closed off partially

S7 is pump overrun which a factory setting of 5 minutes is usual. F75 can be a few things, but as above the boiler needs to see the increase from the pump

If a fault exists with the motorised valve then the Hive won't sort it Could be going to mid position on the valve and coming on with the water Needs some proper wire tracing really then.

Ok. It's suggested the wiring or control if the thermistor has been replaced. I would try another engineer or perhaps Vokèra on a fixed price repair - depends what they're charging and the issue.