UK Man ....I understand....if you are in the open, with a free standing house in the province, for sure u need heating.
In my case different, I'm in between two houses, wall to wall....makes a lot of difference!!! I basically only need to heat when temp falls below like 13-15c at daytime... otherwise the house stays round 18c.....! Actually first year in house I didn't have any heating, and that with 7 meter high ceilings!!! But at a certain point your body just get tired of the cold and you have constantly runny nose. So, yes, I need heating too!