Andehh

I don't see any issues there OP. during that 1% extreme rainfall, everything is going to be wet with water everywhere anyway.....

We fitted 22 LAP down lighters in our soffits from screwfix last summer, and 5 have failed so far!! Bloody things, some are 5m high to access.

As ever with self builds, if it's a problem 1% of the time.....worry about it 1% of the time, until you accept and move on. Very very cold days happen several times a year, you can't win them all.

We have a MVHR with silencers, can still hear it at 40% or higher. We set it at 15% for background ventilation, 75% boost and just let it do it's thing. When Humidity is higher outside it can sit at higher (30 - 50%) and it is audible but you get used to it eventually. If it becomes a problem, we raise the humidity allowance to 70% or something and it drops itself back down to something very low and inaudible.

I don't disagree, but it's a quick way of warning people away when they answer it's not been Insulated since the 80s and their small radiators are scorching hot.... Just saves them the agro....

We get about 3.5 Cop (350% per unit of Elec, vs 95% per unit of gas) out of our Samsung ASHP, which combined with octopus cosy means we make a large saving vs gas. We basically heat out house on 16p Elec, which makes it much cheaper then gas. How well Insulated is your house? Are you running UFH or over sized rads?

I would also look at PIV systems, positive air pressure being drawn in from the loft, which is dryer/cooler, which forces out the damp air in the house. Make a big difference quite quickly.

Not really, it's pretty sticky stuff. Glue top bit on first, then glue side bits so they help hold top bit up, and maybe stick a Broom/brush/curtain pole wedging the middle bit up.

Very benign, just a couple of lines down the middle of the Cork and press fit it well. Use it in an applicator gun like you would bathroom silicone. Make sure both surfaces are clean and dry.

Something like CT1 would do the trick I think! That stuff sticks everything.

Even better idea!

Hot water for washing the car, or a paddling pool etc etc!

I'd get up a camera recording the boundary, well out of reach, and inform builder of this. That'll sharpen attitudes a bit i think.

For the edges I remember them laying a half brick down on the outside, then the block was supported by the beam on the inside and this half brick in the outside. Then again same done between the beams around the outside. I guess technically this means my inner cavity walls are sitting on the blocks, but these blocks are sitting on a half brick for the core of the strength. Sort of see them in this pic here.