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Can you convert to a 2 pipe system? Access under the floors?

Better chance if the rads are piped TBOE (Top, Bottom, Opposite Ends) but still no guarantee it will work properly with a modern boiler and pump. Is it a system boiler? Or a combi? Not sure what you have over there. Are the pipes steel/iron? With a shut off valve between the rad tails, then...

I try to avoid them too. They sag when unsupported due to catching crap in the ribs. And, on ground floor, they are sunroofs for rats.

Never going to work properly ime. How are the rads piped up TBOE?

Well done for doing it properly and adjusting the soil to suit (y)

No. Only fits their waste kit. Been there done that.

Chuck the lot and get mcalpine.

1 pipe system?

Look up priority hot water with your boiler. It would need some pipework and component changes. Not exactly sure without research but it may allow you to have temp for DHW different to that for CH... your boiler may or may not support this... You could also look into CCTs (close coupled tees)...

You could make the system priority hot water and then set the CH flow temp to suit the UFH and rads.

Don't know if the spigots come with something that will take the condensate hose from the dryer... You'll have to make it fit if it doesn't.

Could me marmite for all I know ;) Taste it maybe :) Twist and pull and maybe some washing up liquid to help push n pull.

Well, if all but the smallest zones are off, and the mixing valve works as it should during open zone demand, then the mixing valve may, as wunda have said, become overwhelmed! The boiler pump should also modulate to decrease the flow rate and not over stress the mixer. Do you have any...

OK, so, just to confirm... The only loop with issues is the hallway one, when all other circuits are satisfied?

OK but is the flow pipe going into the correct port on the blending valve? 55° is not out of the park for UFH flow temp. What is the target floor temp for your LVT? What can it withstand? How and where are you measuring temperatures?

It's not a valve. It's the fan speed and burner which "modulate" - basically like your foot up and down on a car accelerator pedal, or turning a gas hob dial up and down.

What's the GC number of your greenstar? If it's a modern one, it should have a turndown ratio of 10:1, meaning that it can modulate down to 10% of its maximum output so - 30kW to 3kW. If your ufh heatloss is lower than this, the boiler will cycle on and off. But! The blending valve should...

Is flow and return the correct way round, going into the blending valve?

Modulation.

What is this? Not sure what you're referring to here!