I recall there being unique reasons of a general lack of insulation and/or circulation built into UK housing, since that value seems ridiculously low. I even fo

I recall there being unique reasons of a general lack of insulation and/or circulation built into UK housing, since that value seems ridiculously low. I even found https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/711503/Heatwave_plan_for_England_2018.pdf https://assets.publishing.service.gov.uk/government/uploads/... (p. 40/41) to corroborate the numbers somewhat.