I guess it just goes to show the massive difference between houses, my yorkshire stone house is reading a comfy 20c in the livingroom, and I’ve not closed the upstairs windows for a good few weeks/ months, I pull them too if it gets a bit nippy/rainey.
It probably helps that its an end terrace, south facing on the end, so the brickwork gets the sun all day long, such as the sun is, in Yorkshire!
I don’t envisage using any form of active heating untill at least september, hopefully october.
Still not looking forward to winter though, last gas bill for the winter period was about £600.