British homes are, on average, 4°C warmer, than they were 50 years ago.

(The fact is that only 7% of UK homes are without central heating and the average temperature in a home is 22°C, compared with 18°C in the 1950s.  This has completely changed the way people in the UK live.  Gone are the cosy little rooms, that were easy to keep warm, and the open plan living / dining / kitchen areas are in.  Of course with the increase in fuel prices, we may be rebuilding all those partition walls pretty soon.)