Is it terribly cold where you are, Schoolclosure? Where I live (SE London outskirts of Greenwich), it isn't cold yet except at night, I have put the heating on low but then it becomes quite hot indoors and I turn it down. I haven't yet felt the need to put on a jumper when going out or even a jacket sometimes.
When I was at school it was freezing! We had radiators which were hot but you'd have to be right next to them to appreciate the heat - or sit on them (& we were told it caused piles :-) ). I can remember travelling to and from school and not being able to feel my hands or feet despite thick gloves and socks. Also thick fog!
Times have changed but so has the weather in this country, winters are milder than they ever were - except when we have a particularly cold spell - and freezing pipes, etc, virtually a thing of the past. I can remember my mum having burst pipes, it was dreadful. I am a 'chilly' person and feel the cold dreadfully but I've noticed in recent years it has not been bad at all most of the time.
Still I suppose the school has to take regulations into consideration and probably has to maintain a certain temperature to satisfy the H&S people.
Does anyone else remember having to play hockey in freezing weather, with red knees? What a nightmare those days were. Climate change suits me - not the environmental impact, just the temperature. In mediaeval times, England was sub tropical!
I expect the children are delighted to have a day off. That doesn't help working parents but usually there are parents within the friend group who aren't at work on a particular day and don't mind having an extra kid on board.
Hope all goes well for you and yours on Monday, op.