(FWIW, Sweden's neighbours like Norway, Finland and Denmark also have houses where it's warm inside in the winter without horrific leaks. And yes, Iceland, even if it has practically free, abundant geothermic heating energy.)
(But what horrifies me in England is not the wind through walls and puny glazing, it's the carpets in bathrooms, including around toilet seat. Experiences are not recent, though, so perhaps they've changed?)