Mr Punter

Would it help if you referenced each of the photos, date, time, adding plot number, lat, long and altitude from the iphone data, and note (like "cavity closer") so it presents the same information as the app? I cannot see how slightly inaccurate geolocation entirely invalidates the evidence you have.

If the brickwork is getting saturated you could treat it externally with a coat of StormDry.

There are mixed views on multi foil insulation. Given the choice, I would go with fibreglass. Some of the multi foils are highly flammable.

Just pour some water on the top. It stops the air getting to it and prevents it curing. It will last 3 months. I doesn't mix with the water. I have just used Joint It Simple but there are lots of brands.

Once opened, store it with water on top to keep it from setting.

That's good. What are the corrugated sheets at the back?

You could set up a ltd co and transfer part. You would need to be aware of stamp duty, cil, cgt and other tax implications and take proper (not Angela Rayner type) advice.

Split the supply should be the cheapest option. The DNO should do a free visit and let you know. You may only get 60A per phase. Bear in mind PV and EV future demands.

Have a good sort through to separate and dispose of the asbestos, timber and building waste. You may be able to burn the pallets on site. You don't want a digger tracking through that lot. There is a lot of prep needed.

+1 Because you have a series of small rooms, this job looks difficult. Get several quotes for someone skilled and experienced to do the job.

Is the wall plate strapped down? If so, you may only need a truss clip or structural screw to fix each rafter / truss to the wall plate.

There are many engineers who can design an insulated raft. They are not suitable for all buildings and ground types. Why do you want one? It may be better to decide what performance you are after (loadings, u values, thermal bridging, buildability) and get the most economical solution designed.

I went paragliding with Tim who did the first GD build. He didn't seem too traumatised by it.

You can get the rockwool in plastic type which can be stapled to the sheathing. What, if anything, has been specified?

What has been specified as cavity barriers and where are they to go? A while ago it was acceptable just to run some 2x2 around openings.