It's 5 degrees here at the moment (Mids) but will rise.
Our heating generally goes on bwtween Oct to March regardless, as it's partly a cost thing, and partly habit - grew up with no heating for the most part, but when we did get it, money was tight, so it was rarely on. As such, I've always been careful, to a point, as I remember being very cold as a kid in the 70s/80s.
Our old, smaller, newer house, was so easy to heat. It also retained heat.
This house is bigger, colder, and all the rooms on the back get much colder. We have a situation where the front bedrooms are in the sun and warmer, but my one teenage son in the back room, his room is far colder, a good few degrees below the others, so this forces us to put it on earlier, while we turn our rads down. He could swap to a smaller room on the front, but doesn't want to.
We both wfh and swear by oodies, electric throws and electric blankets.