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Not sure about the planning laws, but deeds also can incorporate restrictions. Just curious, why would you want to build the wall? Seems anti-social, and also a trip hazard when you come home from the pub ;).

..... and when you've put the carpet down you'll forget all about the cracks. ;)

Round our way they've been replacing water meters. The low pressure light in our shower now comes on intermittently. That may have no connection to the meter replacement, and I suspect the companies may have reduced pressure to help conserve low water supplies nationally.

Does that plastic two-part lining around the hole just lift out to allow inspection?

Are you sure the 3-port valve is not mechanically latched open?

There are two other items visible like the one you have arrowed. Is there another similar one nearby, hidden under that wiring sheath ? I'm thinking four similar components could be a rectifier bridge. If so, the flashing near that one could indicate a faulty diode or a poor connection to it...

Ah, in the pics it looks lke white plastic. Perhaps something like this would do the job?

Yes and yes. Rat stowaways on ships used to be (still are?) a big problem.

Sounds as though there could still be some air circulating in the pipes. Try reducing the pump speed.

Can't you just make covers from a bit of white plastic and stick them on with hot melt glue?

It seems to be putting all your eggs in one basket. Once the system gets hacked, all your accounts would be compromised in one go.

Are you sure you are detecting heat loss via convection, rather than conduction? Water-filled metal pipes will be quite good at conducting heat from a hot cylinder to a cool boiler. The heat flow may be unequal in the flow and return pipes due to diferences in length, bends, insulation, hence...

I'm grasping at straws here. In a hot water cylinder the water at the top is usually warmer than at the bottom. If the pump and boiler are inactive, the water at the top cools a bit faster than the water at the bottom (loss of heat being proportional to temperature excess) and so will sink...

Perfectly safe.......NOT!

Does the flow pipe from the boiler enter the top or the bottom of the heat-exchanger coil in the tank?

Fixitflav beat me to it. I don't see how convection as described would occur in the usual layout.

Any condensation on the cold pipe might show up on a kitchen roll test?

I've recently been experiencing occasional 'low pressure' warnings and heater cut off with my shower. Only in the last couple of months. I do wonder if the water companies have been instructed by the authorities to reduce pressure generally, to save water, given that the UK's water supplies are...

If your invention is a product, then bear in mind that as soon as you put it on the market there will be a Chinese copy of it on sale at half the price a week later !

Ensure the support-framing of the T&G has diagonal bracing to prevent door sag.