On 27/11/2020 13:55, Caecilius wrote:
I'm sure I can't be
the only person who want a constant overnight bedroom temperature
without running the main house heating.

I've experimented by turning the central heating off overnight and it
doesn't seem to reduce gas consumption much. It seems to mean that the
house is horribly cold for the first hour of the day and the heating
never switches off all morning and most of the afternoon. I think the
thermal momentum of a brick building and its contents must mean that
cooling down and warming up take an inconvenient amount of time.

Bill