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My guess, and it is a guess, just badly made. When you cut it out it may be perfectly normal inside

The flexi seal adaptor couplings with a jubilee clip come in a variety of sizes. Sure you will be able to find one that fits. https://www.flexseal.co.uk/assets/Data-Sheets-Folder/Flexseal-Adaptor-Couplings-Datasheet.pdf

It is diverter valve not properly closing the heating circuit. It is a mechanical item so should be straightforward. You can buy a complete exchange refurbished valve for £45 if you can not see the problem.

Yes replacing the actuator head IF it is in fact the problem. It could still be cylinder stat, programmer or room stat. What I was saying, with valve manually opened, remove cylinder stat to keep hw &ch running pending test & replace failed component.

To keep it going just remove the cylinder stat from the cylinder

So nothing is connected to the coil in the cylinder?

Have you removed the shower door? Your video doesn't quite travel far enough to tell. Reason I ask is, the sealant hidden behind the door frame is a very important part to get right.

Thanks Duz, now we are all hoping that we never need it!

Is your heating tank fed or sealed system?

Can you put a copy on here? May be useful to someone

Sorry, so it doesn't. I have this, not much but may help:

If it is the Optimax HE 31C

The boiler shuts down when it is up to temperature (Return is hot) so it is circulating around either the cylinder or the "easiest" rad and going back to boiler. Is it any better on heating only? Is there a rad that gets particularly hot? Is there a by-pass, perhaps in the airing cupboard?

While the power is OFF, remove the cover on the side of the pump and see how wet it is in there. If it has water over all the connections this will cause the trip to blow. Unless water can have dripped in there from above, tracked along the cable, this will be a new pump.

Running out of ways to say this.Boiler is still full of water and coil in cylinder is still full of the same water. Cylinder is in fact still full of water, not that that matters. Boiler will not be aware that it has heated a cylinder full of water which you can not use as you have no cold water...

The over ride button on the programmer? Heating is on twice a day and due to come on at 5 o clock You come home at 4 and are cold. Push the over ride button & heating comes on now but will go off at 10 as normal.

The cistern in the attic stores the water which feeds the Cylinder. The cylinder supplies the hot taps. The water in the cylinder is heated with a coil which is full of system water which is heated by the boiler. Yours may be tank fed as below or pressurised (filled from the mains). Either way...

Heating system water and domestic hot water are completely seperate so when your cistern runs dry, central heating circuit is still full. You can therefore leave heating & water on even when domestic tank has run dry.

I think that they silver solder everything over there dont they