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I'd definitely be getting shut of the aejec and using a more conventional H section. No reason you can't use something like tectite classic fittings if you don't fancy soldering. Couple of pictures of a removed Airjec unfortunately fairly typical of how they get, causing pumping over problems.

First if your the third or fourth plumber in a short time I'd be very wary . As above return temperatures on most oil boilers need to be above 40c. We have achieved this in past using temperature blending valves to keep return temperature up.

Yours is one of the older Grant combi's as it got the 3 dreadful auto air vents on. We now swap them for manual air valves. The combi's can be tricky to clear of air and every time you drain boiler your back to square one. If the water in boiler if dirty it's the same in rest of system . I would...

Assuming all rad valves are fully opened turn off all radiators that are working to force circulation through non working rads. Make sure no air in rads if a sealed system it's up to correct pressure.

That panel is old enough for that to be a salt glazed collar coming through floor. The joint is almost certainly yarn with sand and cement finish that is normally rock hard! If you want to paint it maybe remove lose stuff bit of filler and paint. Also it looks like pan is cracked other side of...

The one you tagged B A is return port C is pressure adjustment don't touch without a pressure gauge Connected to B and combustion analysis equipment to make sense of any adjustments.

No issues when in domestic premises, though we always check condition of water in existing systems treat as needed and always add inhibitor. Did a series of large restaurants at one point, did have trouble with rads rusting in toilets partially the gent's! Cured by fitting stainless steel rads.

I live near enough to the Stelrad factory to have been round it a number of times and collected rads from there distribution center . Henrad is Stelrad just different package. Apparently Stelrad own factory's in Turkey that turns out other rebranded stuff.

Henrad are Stelrad radiators re badged for independent merchants. Panel rads are finished by a electrostatic process where the paint finish is 'baked' on . Unfortunately rads do rust in bathrooms it's a damp place! I'd be taking care with the one that's bubbling may just be a pinhole behind...

As above check combi manufacturers instructions. Going by the hose union tap it looks like new cold connection was made on incoming supply to softener rather than softened side. If you can use softened water in your combi needs pipework altering. I'd be swapping those small flexi hoses for...

Vote for loctite 55 here used it for over 10 years at one point had a team of 12 . We use nothing else never yet had a leak . Can't say that about ptfe!

Each make of pipe has its own insert Depends on fittings make/type if it's demountable. Clear picture required!

Agreed that's a Y plan with a god dam awful airjec doing cold feed/open vent. Im betting that's full of crap. Cylinder stat should be higher up as well. Boiler stat needs turning down a bit they do get out of calibration.

Changing a number of rads indicates a serious problem somewhere. Get a magnet and check if pipework adjacent to pump and cold feed and open vent . If full of crap magnet will be attracted to pipework. Re quote just looks ott try getting someone who's experienced with your type system to look...

As above snapped spindle replacement valve only cure I'd fit a decent lever valve.

First move is to turn off all rads that are working see if the others come on. If they do system probably needs balancing.

Taping pin gently normal works. After that if your not confident in dealing with it you don't need a degree in plumbing you just need a plumber! We would just freeze pipe adapt it then fit new trv few minutes job but we have the gear.

As above try finding leak. If it's taking 6 weeks to drop pressure I'd be having a good look at all rad valves . Take of heads of trv's and dust caps off lockshields. Auto air valves if you have any can be another source of problems. Just fit a decent system filter, difficult to understand...

We have used many hundreds of polyfit fittings on first fix with zero problems. I certainly wouldn't be bothering to change undisturbed fittings . You can use speedfit fittings on polypipe tube but you must use the polypipe inserts. Most polypipe inserts are now black plastic they work...

That's one of the polypipe versions (polyfit) As above push collet in and pull pipe out.