em, I remember having chapped knees the first winter I was in Dundee! I was used to the wet west of north Lancashire. Plenty of wind but not quite so cold. Usually. Then, when I was cycling between Dundee and Barnhill, the wind always seemed to be blowing against me along the Tay Valley whether I was going east or west! But I agree, I found Edinburgh much colder than Dundee even though it's further south. The lowest overnight temp we experienced in Edinburgh was –17°C in the early eighties. I forget which year exactly but our kitchen sink outlet froze up. Washing-up water had to go down the loo for a few days. And yes, annobel, Oxfordhire nights were often as cold as Edinburgh ones but the winters were shorter.
Our heating comes on for an hour each morning and then we switch it on as and when it's needed. None today so far as it is relatively mild but last week we had two very cold days and it did go on for a while.