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One of the original articles about Part O name checks single aspect new build flats that get hotter through the day and don't let it out. It's like they were describing the flat I live in now. It's impossible to get airflow without 3 fans arranged to circulate air from one window to the next and on a hot day by 5pm or 6pm it'll be cooling outside but be hotter inside than it was at 1pm.
I'm game if you're serious :-D
Ours has a very high air tightness rating as I guess most new builds do and it just means that heat builds up and up and up. Couple that with being always in the sun - no other houses or trees blocking the house - and it's really fucking warm.