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put another way, what's the accepted construction method near the roof for such a frame inside brick walls? Seal across horizontally, or let air flow everywhere?

ok all many thanks. Will park that idea for now!

having a related problem but not dot and dab, I do know that the dot and dab should be sealed at the top with a solid bead all the way across so that the vertical cavity void is more or less airtight. Many dot and dab installations do not do this, which leads to the problems. Can be solved by...

the plasterboard is standard plasterboard with approx 3" thick kingspan (celotex?) on the back, with the void being behind that. Draughty means cold blast-of air if backbox removed, and walls are noticeably cooler to touch than other walls in house, and room temp is noticeably low

Am putting in solar and battery system. I know I can heat my hot water with an immersion heater, but can I also fit an immersion heater into the closed central heating system that is currently heated by my oil-fired boiler? I can't find anything online about immersions in the wet central...

Have brick-built barn, which has been previously converted by putting timber studding about 30cm from inner brick wall and covering with Kingspan. 2 of the rooms are at angles to the rest of the building and are much colder, both single story with vaulted ceilings. Both have huge draughts...