I'm not asking about the coldest you can bear, or looking for tips for dressing . I mean walking around in reasonable non summer indoor clothing and then being sedentary watching TV/reading etc. House is small, well insulated, double glazed etc, low bills to date, London.
We have just replaced our creaky old boiler with a silent new one plus (overly complicated ) multi setting thermosat/timer . We are experimenting atm with different combinations of day settings (dislike heating when sleeping). It isn't particularly easy to justad hoc bump up the heating by a bit, unlike our previous rotary dial one.
I had realised our last thermostat calibration was way off when 18C felt toasty and almost too hot. Looking at maintaining 21C/ 22 C on this new system currently. Is that a common preference ?