Insulation is definitely an issue and we’re working through the list:
Single glazed Juliet balcony door in our bedroom - getting quotes to replace
Single glazed patio doors downstairs - will replace
Have put up a curtain at the draughty front door, just made a draught excluder and that’s in place, have added insulation strips although the door is original and quite warped, so you can still see daylight…
Some other windows didn’t have curtains, so we are in the process of adding them.
Big thing is a side passageway under the house isn’t properly insulated, so the bedrooms above it are cold. Getting quotes to get that insulated.
There’s more but those are some of the big ticket things!
Bedroom radiator - it’s an old style Victorian sort, so is actually quite big, think the issue is probably the insulation points above.
Re TVRs - we use every room!
I think we do need to have the heating on fewer hours per day, and keep topping up the hot water bottles…