I loved your video.
We don't have a thermostat; we have individual radiators. But the temperature is probably lower in the UK because of the cr@ppy windows. Our living room was 15 degrees and our bedroom 8 on the coldest day (Why yes, my husband is obsessed with weather why do you ask?) because of the single sash windows.
My parents' house in the US is older, 1906, (I know an American house that is older than one in the UK!) than the UK one I live in, 1920s ish. But the American one has, and always did have, double paned windows the top bottom configuration, so the outside and inside top was fixed, the outside/inside bottoms could be raised and SHOCK a screen could be dropped into place for the outside bottom.
Also, turning up the heat here is just wasted because it takes so much more energy to heat a damp room than a dry one and the US is mainly dry in the winter.
So that is my reasoning. On the other hand, I never use the dryer here, but then my parents never used one in the US either. They didn't have a dryer for two years.