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Exactly!

Replaced a radiator and bled it, if that's your analysis of the situation you sound like cowboys with no idea i.e. was it a pressurise system that needed re pressurisation or a gravity fed system, did you just isolate the old and fit the new radiator.

Bang boiler stat up to 6 and see if that works in the short term but sounds like its time for a new boiler

And does this happen straight away or when the system has been running for a while and all the radiators are hot. Try putting boiler stat up a notch. I assume one of the radiators does not have a TRV setting so flow through the system is not blocked off completely at some point in the heating cycle

And has it made a discernible difference?

Reminds me of perps who always add more solder to yorkshire fittings :unsure:

A winner!!

Or he is lucky and immersion spins round due to initial torsional force, winners and losers

Surely as soon as you apply any force on a nut you are inducing torque???

yes

I would drill 1/2" hole in the middle of the sprung coving, 1" from the end and then shoot coving adhesive into it so it fills in the back and also crosses over to the adjacent piece, then push the sprung bit back into place and secure. Securing is the hard bit but a couple of nails up against...

Trying to squirt anything into a zero mm gap aint going to hold

AS Morq says, but does not look like you have the upward movement available but if you could you would be advised to use some support bricks for the radiator to rest on when hinged downwards to prevent strain on the feed pipes. Other option is to place bungs in the feed and expansion pipes so...

Yes he asked a long question

Why do you want to remove the radiator, if it's just to decorate and then put it back there is another option.

Well one of the valves isn't working so assuming it's the radiator valve you need to remove the top control section of this via the knurled nut holding it in place and replace it with a capping piece that holds the thermostat pin down

I would definitely say you have air trapped in that section of raised pipe but to what extent??. Possibly if you had the pumps at high speed it would push the air out and into the radiators for bleeding off but I would also imagine that the isolating valves are severely restricting the flow...

Sorry I said rafters for some obscure reason when I meant the ceiling joists.

What distance do your rafters span, what support walls if any are underneath the span of the rafters

Yes you flagged it up in post 1021, currently watching it agan in 10 mins chunks to try and stay focused