I have been watching an episode of "Are You Being Served." These days we boast of non coal generation days. Back then we generated most of our electricity by coal fired power stations. Back in the 70s we had the three day week. The episode entitled "Cold Comfort" shows how the staff of Grace Brothers tried to keep warm in the winter at work when the heating was turned off to conserve energy. These were the days when we had to fit 13 Amp plugs to things like electric blankets as appliances came without fitted plugs. I expect that forum members are too young to remember the 70s? (I'll have a double please).
Anyway here is a link to the episode in question. How many novel ways did the staff find to keep warm in the cold unheated department store?
https://www.dailymotion.com/video/x44pkux
Z.