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Bit confusing that post! So, you're getting them to mole a new main in, in mdpe? Or are they digging a trench? I'm a Gas Safe plumber, heating engineer and drainage guy by the way, so I know what's what :)

Does the room ever feel very cold or generally comfortable?

Most custards don't! And is why it's standard practice to add 20% when supplying... But that is like forbidden fruit, nowadays, when customers think they can save a few quid by ordering stuff online! Trouble is... The online suppliers don't have a clue what they're selling and don't care!

The only reason that you set them to high/max/5 before removal and replacement is that it moves the internal plunger further away from the pin in the body which is/should be spring loaded... Thus you're not pushing against resistance as you try to refit the head. Do tap the pin gently before...

Up to you, but I'm a plumber and when customer buys it, they carry the can for any problems with the product. Either way, make sure you flush them out before fitting... Many of them are full of burrs, rust and manufacturing debris

Whenever you go to a leaking joint or component... Always look up ^^^

Practically welded after all that time ;)

Words out of my mouth ;)

If your boiler allows it, I would consider sealing the system.

It's part of @ree's modus operandi.

So.......?

:unsure:

But it's both manifolds so 2 pumps!

Mountains from molehills :rolleyes:

If the rads all get hot throughout then no need for a powerflush. However... A drain down and running cleaner through the system for a week, then draining again is always good maintenance. PowerFlushing mini bore would not be fun.

New boiler as well so potentially flow and return was reversed there during install! Edit: for both manifolds not to be working, having worked previously before for many years, the problem lies upstream and what has changed recently! The boiler! Would be my first port of call. What model boiler...

Find a friendly chap from Welsh water and ask him if he's interested in a private job ;) Just look out for their vans or whoever does their subbie work.

This ^

Plate hex possibly blocked if you had aliens in the incoming main. Might also be blocked on the primary side.

I'd go with the batten across to studs. But may also be to bring cistern out to line up with soil as mentioned above... Depends on age and type of property.