I got in from work, last night, and even I thought the house seems a bit chilly.
It turns out my heating is set to come on at 14 degrees.
I didn't change it, and it still came on this morning.
I've now cranked it up all the way to 16.
I shut the last window a couple of weeks ago, and even before starting a month of 'well go and put a jumper on' yesterday I cranked the heating up from 15 all the way to the dizzying heights of 16 degrees.
I must be getting old.