So back into the gloom.
And a week ago, the weather forecast was for snow -- which turned out to mainly being heavy rain, with a bit of slush on the road as I was driving home through Bourn.
The forecase for sub-zero nights and days of single digit temperatures to follow did come true though -- but thanks to the new cavity wall insulation, turning the central heating on (3 weeks later than usual) for just an hour or so morning and evening was sufficient.
And having changed from summer to winter duvet at the weekend, it's back to the summer one and heating off by default, now that temperatures are in high single figures outside.
All it can't fix is the shortening of the hours of daylight.