>>41006326England is A LOT colder than the US in general, even moreso if you go up to Scotland, so most English people have a layer of fat to help regulate their body temperature, like seals.
It's why whenever heatwaves hit the UK, English people pretty much always get heatstroke or heat exhaustion and can't handle it. Because of their excess bulber and lack of air conditioning (except in large offices), they overheat easily.