Hi, an interesting set of results. I “liked” the heat loss around the ceiling light fittings in the kitchen and the air-vent at low level in the lounge. You have thought you could deal with those lift fittings - what is the insulation material in that slopping ceiling generally?
I guess in terms of ventilation you could do with some temperature and RH% sensors dotted around the house (approx 4 no. will probably be more than sufficient) to check the humidity levels prior to making changes to the ventilation. Have trickle vents been fitted with any of the (new) windows? How many extract fans are there in the house (ducted to outside)? Look to Aereco vents for possible alternative to trickle vents or to replace that air-brick (but at a better location).
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