JohnMo

Why not just go 4/5G? £20 for unlimited data. Get one these hubs for £58. https://amzn.eu/d/jlWgSgm Add an external aerial if needed

Masonry paint or emulsion. Try on a small area, make sure it stays put before you commit.

Mix ratio is on here https://forum.buildhub.org.uk/topic/25228-airtightness-parge-coat-vs-airtight-paint/

Our walls are Durisol (pre Ecobrix), we parge coated with a cement, lime, building sand. Mixed with water to a double cream consistency. Then applied with a broom. It fills all the holes in the block and all joints. Wall becomes airtight after. Should last for ever. If want any colour other than grey paint it after.

This system is all Class 2 certified, so could be used as a sales meter if you wanted, for both input and output energy - so very accurate. Would expected the energy output side the Vaillant (dT, flow and return temp, and flow rate) are all industrial quality so way less accurate, electrical input may be class 2 certified on the Vaillant. But if you can plot either system (enerymon or Vaillant) you will get like for like comparisons, so you can compare any changes you make, for real conclusions of, is this better or worse than before.

As if by shear coincidence, the exact thing you need, has been invented and in daily use and they only costs about 80p. Many would say that is too simple and they need complex, with sensors and timers and may be something like home assistant or Luxome to control it all. But many house holds have managed to use light switches, quite intuitively and your normal electrician can fix them or replace with ease. But are unlikely to go wrong in a life time. Sorry that is my input, maybe not what you need hear. But...

I have tried to that with mine and hit a few issues First issue, was actually predicting how much energy to add to house. When setup it over applied heat and it wasn't accurately predicting future heating needs. It actually upped the flow target temperature and generally used more energy than really needed. Example two similar temperature days one doing everything based on cheap rates, battery, PV etc, it used 14kWh through ASHP, the second day nly used 8.8kWh. The second day was very much simplified just run WC and let heat pump run as it wanted. Second you are dependant on the internet, something like home assistant to drag across your battery/solar and weather data. You may be able to sort it all out, but will anyone else if something isn't working as expected and you aren't there. Third, couldn't get Agile to make any financial sense (not enough cheap slots) and the added complexity just a pain. So went Cosy, super simple. If you are running thermostats, just add 0.2-0.5 degs to target temp in the 3x cheap slots, the heat pump should stay idle for hours after, especially if your heat pump can run a second higher flow temp set point during cheap slots.

Post a link to the instructions and what you are stuck on

Tell him he has 24 hrs to remove or you will report him for fly tipping.

They say eating meat is bad for you and the environment

Or just go AC coupled battery (with gateway), a normal string inverter for PV. You will need an earth spike. Then just operate in island mode. Once you have a grid connection take out of island mode. AC coupled will provide whole house with power. A hybrid inverter may only do a single circuit when no mains is connected.

Just had a look about and Rointe Onyx HHR Storage Heater don't look bad Stiebel Eltron SHS Storage Heaters - HHR but boxy but looks pretty clever. You should only need a couple, bedrooms would just be panel heaters anyway

If your weather is anything like ours you PV will be producing nothing. Just get your grid connection sorted.

Do you have two inverters or one and what make is it? You keep mentioning two different makes Is a string or hybrid inverter?

Didn't use anything really Use Excel spreadsheet to keep track of costs. Used Excel to build a plan, that was about it. What do mean everything legal is logged?