Temp

Past experience. LED themselves are pretty reliable. Drivers on the other hand tend to be crammed into a little box with minimal cooling. Some types of capacitor are particularly sensitive to temperature with their expected life halving by every 10C rise above about 40C.

It's unlikely to be the LED boards themselves unless they have more electronics on them we can't see.. More likely the driver module or capacitors in it.

Ok so the issue is where the higher garage founds meets the lower house. The ground must slope down to the house in this area so you also need to think about drainage and the visuals. You don't want to be looking at exposed concrete. I would expect a standard stepped foundation a few feet along the garage wall away from the house depending on how the ground rises. Some engineered bricks might be needed where partly burried? Check ground levels carefully to avoid the wall of the house accidentally becoming a retaining wall. I agree an SE needed to design how the garage floor slab abuts the house.

Most bathrooms need some sort of storage. One option is to build storage against a wall and run the waste in the bottom.

Yes think I'm out of date.

I assume they aren't talking about a Building Control Completion certificate but some sort of Completion Certificate for Council tax purposes only? I wonder if the latter could trigger the 3 month window for VAT reclaims. In my case (at a different council) they just sent me a letter stating they are assuming I will be complete on some date. I disagreed and told them it will be complete on a different date a few months later and they accepted it.

Contact companies that make metal or concrete garages and have them confirm theirs meets the regs. Perhaps pay for pre application advice from the planners and send them brochure images? The regs also include the foundation slab suitability for the ground conditions so you may need to dig a hole to check how thick the slab is? Think about how it will be sealed to the slab to stop water running in under? Ditto at the doors?

Not me but Google AI said.. "The specific RS485 communication protocol used by Acrimo for their motorized products is generally a proprietary protocol and is not publicly published or standardized"

Not sure about grab rails but tile and stone over 12mm Hardiebacker board seems to hold things like soap dishes and shower head rails well without needing to find studs. I think 12mm of anything might be marginal for grab rails? Can you drill through into the brick?

I can't quite visualise what you are building but check building regs. They require quite a deep (thick) "constructional hearth" if the fire pit/basket/chamber is capable of raising the temperature of the hearth over 100C. For sealing joints perhaps fire cement? Not sure what colours it comes in but try screwfix/toolstation web sites.

Id probably glue it in place.

Lots of wind farms in East Anglia. Very few south of London.

I make my own extension cables when I can because commercial manufacturers are under cost pressures to use as skinny a wire as they can get away with.

If you feel like it you can always get one done and keep the results to yourself. But I wouldn't. Tell the Architect you will investigate and carry on.

I hope that was by email. Contact them ASAP. Perhaps decide beforehand how much of a discount would persuade you to keep them. I would also measure them all to make sure there aren't other issues.