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You’ll have 2 which are both operable - one for the hot water fed via the combi, the other being for heat for rads and cylinder. As we’ve mentioned the cylinder needs to be 60 to prevent legionella, so unfortunately, unless you can use the immersion over summer, then that radiator temperature...

If it’s 27, then that’s far too low to heat a cylinder which is set for 60 degrees, so boiler temperature would need to be approx 65 to reach the 60, depending on runs and insulation.

I think you have 2 motorised valves as one will be heating and the other to control the heated water to the cylinder. Lack of resistance is usually an indicator that the valve is open, but if it’s not energising the microswitch then that’s likely why you have insufficient hot water. You could...

It doesn’t look like it will be and it’s 110mm used normally.

Should be ok, and does look cemented in. Once the pan is dislodged, you should be able to remove the drain connection easily.

Does this help? https://www.wernerco.com/uk/step-ladders/740Series/7400418L

Might be worth getting a G3 registered engineer to have a look as the cylinder thermostat has been removed.

Yes, seems logical. Probably struggle to get a replacement powerhead (likely failed component) but a quick search suggests some brands are interchangeable with Sunvic. Looking at the screws, I would say the head is removable and the spindle could then be checked.

No reason, but perhaps there wasn’t enough material?

Sorry, I got mixed up with what you wrote:

Probably better splitting it down and taking the washer to your merchant/diy chain.

Any issues with system pressure loss on the heating circuit?

Anything printed on the pipe?

Just done a quick search and 300mm arm available?

Maybe do some voltage testing? Heating on to room stat should be 240vac, room stat to motorised valve and or pump should be 240vac

Did you check the toilet pans for running water or the cisterns?

Obviously impatient. Maybe one of these who drives at speed to get places?

Just gone through some of your old messages but they seem to mention blockages and powerflushes. Glad you’ve sorted the problem.

I wouldn't say a common fault, but it does happen. If they're over 20 years old then likely need replacing. Just double check the wiring.