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I think it has to be more than 1m away from the house to be counted as an outbuilding rather than an extension. The dimension rules are different for outbuildings and extensions.

Got any 12mm WBP spare? Could use that to stiffen the whole thing.. 146 + (2×12) + (2×9.5) = 189mm

Did you send in the CIL exemption claim form at same time as the PP application? If so I suspect they couldn't process it until PP was granted and not sure anyone will have told them.

To get enough heat transfer warm air systems need much higher flow rates than MVHR. A friend if mine had ducted warm air heating and even with the higher temperatures of a gas boiler compared to a heat pump the flow rates were high enough to be noisy in bedrooms at night. Our MVHR is inaudible.

Our UFH ystem is unpressurised so easy to put inhibitor in via the header tank.

Normally only an issue for much bigger trees on some types of clay soil.

https://www.knotweedhelp.com/japanese-knotweed-uk-map-how-close-is-it-to-your-home/ Check if its in your area already. Might help you deflect any blame but best deal with it as it can affect property values and make houses harder to see.

I think its more about getting sufficient flow rate to shift it rather than the pressure. Consider putting some corrosion inhibiter in the system while you're at it. Check the amount needed on the instructions as you may need a few bottles. My system needs something like 3 * 500ml bottles.

Building Control drawings are intended to satisfy Building Control that the end result will meet the Building Regulations. Architects will happily sell you a set of Construction Drawings that tell the builder what to build. They may contain more details not required by Building Control.

If other taps are OK it's looking more like an issue with the pipe to the kitchen tap or the kitchen tap itself. Some taps have mesh filters that can scale up, either on the inlet to the tap or the mixer outlet. By PRV do you mean you mean a Pressure Relief Valve or a Pressure Regulating/reducing Valve? Eg does it have a tun dish and outflow pipe?

Google finds.. https://pumpexpress.co.uk/explaining-cold-water-accumulators/

I wonder why they were isolated? I think these work a bit like large expansion vessels. See if water comes out when the precharge valve is opened.

Shouldnt really as rain can splash onto wall above the dpc.

Another with pictures. https://www.pv-magazine.com/2021/09/23/triple-solar-unveils-new-photovoltaic-thermal-panel-for-heat-pump-houses/

Importing is a bit hit and miss at the moment. On arrival in UK you should be charged import duty (which might be zero), UK Vat and probably a handling charge. Only the UK VAT can be reclaimed. That said I've recently imported from China and Italy and paid nothing other than what the seller charged.

They have been sending such letters for at least 14 years as we has virtually the same reply to our full planning application..

If their foundations allow, you could dig a bit deeper, put in a perforated pipe leading to your (or their rainwater?) rainwater drains and cover with gravel. Keep the top of the gravel 2-3 bricks below DPC. If you want to fill the trench higher you would need to tank the side of his garage and then do the above. Personally I wouldn't do this.

https://www.pv-magazine.com/2021/09/21/hybrid-pv-thermal-modules-providing-heat-source-to-brine-water-heat-pumps/ Quote: For two years now, the entrepreneur has no longer heated his home with gas, using instead a brine-water heat pump. That would not be a surprise, as such a system is a standard solution, with the brine being heated up with geothermal energy via a borehole and the heat pump powered with solar energy from the roof. Siegerink, however, did not use a hole in the ground. He developed an attachment that he strapped onto the back of the photovoltaic modules as a heat source for the brine-water cycle. He now produces and sells this solution with his company UseAllEnergy. With this attachment, a heat exchanger, he transforms standard photovoltaic modules into photovoltaic solar thermal (PVT) modules. Such hybrid panels have been around for a long time. However, they couldn’t prevail on a larger scale. One reason for this is that the conversion of a standard PV module would put at risk the manufacturer's guarantee. Another reason is that the water temperatures are not close to the temperatures that pure solar thermal collectors can offer and heat yield is limited to very sunny days. Siegerink was able to solve both problems. Continues..

https://www.fsp-law.com/planning-permission-and-commencement-of-development/ Some councils will tell you what they require you to do. In some cases this is digging foundation trenches, getting them inspected by Building Control and filling them. The problem is that you have to pay a fee to Building Control to get started and some will close a file if progress seems to have stopped. If the council won't tell you then it is possible to do some work and apply for a certificate of lawfulness to determine you have officially started. Wind farm developers sometimes do this while they wait for the grid to be upgraded. Problem is the fee.

We went for 12mm Hardi backer board and would do so again in shower areas. Its hard work to install as its so hard and heavy but our builder recommended it and its bomb proof. I've fixed things like soap dishes and into it and they have remained solid for >10 years.

Welcome to the forum. Can be a bit tricky with clay. An extension that small isn't putting a lot of load on the foundations so that's not really the issue its how the clay may move as it expands and contracts. Probably the best advice is to make them similar to those of your house in terms of depth. Perhaps also line the sides of the trenches with insulation boards before pouring concrete to prevent movement causing an issue. That might well be overkill but its hard to know what you can get away with.

This looks different to the earlier photo. Two switches now on the left? Is there a red wire from one face plate to the other? If so it still looks like Permanant live on Red. Switched lives to the lights on yellow and Blue.

I recal the government are/have consulted on water companies adopting private supply pipes. No idea if that's likely though. You could agree an option to purchase subject to a satisfactory bore hole supply being achieved.