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3:1 sand : cement (some would even go 1:1) , you lean in and contour/shape/polish it as it goes off. Waterproofing/accelerant additives as you like.

Oh, but they come up with most creative mumbo-jumbo about "how they work" [i.e. presupposing that do] but are (ahem) more reticent on the subject of independent trials evidencing that they do anything but sweet FA.

Nah, follow the manufacturers' instructions and you'll be fine.

Unvented vessels of up to 15litre capacity are exempted in the regs. I'd recommend, if you're going for the Ariston 10l on mains water supply, to fit the full safety kit including expansion vessel.

You don't own that meter so not your problem. The leaks you higlight are all part of the meter installation. Call your local water undertaking or whoever you pay your water bills to and tell them there's a leak at the (internally located!) meter.

You don't need to prime your pump.* You do need to ensure that your pump position and pipework layout are exactly in accordance with the pump manufacturers written instructions,where you'll find several acceptable alternatives. * other than running the shower both hot and cold with the power...

It's a grey area. For example a small B&B serving half a dozen cooked breakfasts on a domestic cooker would not be regarded as commercial for gas safety purposes although "commercial" in the sense of money changing hands. Do please ask Gas Safe for a ruling: I'd be interested in their response.

^^^ My view exactly.

Small needle-nose pliers or dental hook.

Soil pipe suspended from clip with a cm or so above full insertion from socket end below or resting on lower socketed end?

Usually a grub screw (allen key required) either at the back or found by unscrewing lever handle.

Are you sure you have the right pipe? The cold feed to the boiler is the top one in the first picture, entering the boiler second right.

It's most unlikely that your receiver is inside the boiler. It's very likely to be near it ; follow any wires from the bottom of the boiler. You can link out the wiring at the receiver - power off first. https://www.thermalearth.co.uk/content/1/uploads/Manuals/Salus/Salus-RT500RF-Manual.pdf

You'll be fine. Drain only the top few inches of water from the cylinder and use a blowtorch on fitting if stubborn. Not Essex. Essex Flange is for the brave!

I have no idea of the regulations on heat pumps (gas bod myself) but if a heating primary filter were installed the return would be the preferred position.

T aka 92.5° branch Don't ask Y. Probably doesn't matter here anyway.

Yeah, avoid "high maintainance" Back on topic: OP, its not something silly like the grub screw on the overflow/control knob being loose?

Never select on bodywork alone!

Because real life is not like the movies!

Try https://plonke-shop.de/Heizung-Sanitaer/Rohrsysteme/Fittings-fuer-Rohrsysteme/Verschraubungen-fuer-Wellrohre/ Other less comically named retailers are available!