7C overnight here, so I don't feel too guilty about having turned the little heater next to my desk on.
But if it's only 3 days since you turned the heating off, Jem, it must have been a lot cooler down there in Essex (just before those three days) than it was up here in Suffolk. I turned my heating off well before that!
What's central heating? I live in a Manx stone cottage which is heated only by a coal fire with a Dunsley back boiler. I don't want to go into all the technicalities of the gravity-fed system & all of that, nor do I want to moan about it, but you learn to deal with what you've got, and adapt.
I do know that when I (re-)visit the south of England (where I'm from) I seem to be on a mission to turn all their radiators down - I'm far too hot!
Why do so many people (I'm afraid particularly in the south) have to have it tropical at home so that they can stroll about with little on?
I think it's just a matter of what you get accustomed to. Personally-tho I am in the south-I hate being too hot,but sometimes it's a delicate balance between hot-just right-cold.
Also-what you find comfortable changes with age.