Here goes. I've done my best here, but if anything I've probably underestimated the number of official stations showing snow.
Leek Thornecliffe (N midlands), 298m
Spadeaham (NW England), 285m
Loch Glascarnoch (N scotland), 265m
Tulloch bridge (NW scotland), 237m
Aviemore (N scotland), 228m
Lough Fea (N Ireland), 225m
Connaught (W Ireland), 203m
Eskdalemuir (SW scotland), 200m
Biggin hill (London), 170m
Inverbervie (NE scotland), 134m
Luton airport (London), 111m
Bingley (W yorkshire), 84m
Altnaharra (N scotland), 81m
Wittering (E midlands), 73m
Shawbury (E midlands), 72m
Waddington (E midlands), 68m
Cranwell (E midlands), 62m
Oxford airport (W midlands), 61m
Newcastle (NE England), 55m
Leeds and Bradford (Yorkshire), 41m
Pershore (W midlands), 35m
Aberdeen (NE scotland), 19m
Lerwick (Shetland), 18m
Wick (N scotland), 16m
Doncaster (Yorkshire), 16m
Stornoway (Outer Hebridies), 15m
Baltasound (Shetland), 15m
Inverness (N scotland), 13m
Kirkwall airport (Orkney), 11m
Tiree (NW scotland), 9m
Lossiemouth (N scotland), 6m
Coningsby (E midlands), 6m
Holbeach (E anglia), 3m
2024/2025 Snow days (approx 850hpa temp):
18/11 (-6)
2023/2024 Snow days (approx 850hpa temp):
29/11 (-6), 30/11 (-6), 02/12 (-5), 03/12 (-5), 04/12 (-3), 16/01 (-3), 18/01 (-8), 08/02 (-5)
Total: 8 days with snow/sleet falling.
2022/2023 Snow days (approx 850hpa temp):
18/12 (-1), 06/03 (-6), 08/03 (-8), 09/03 (-6), 10/03 (-8), 11/03 (-5), 14/03 (-6)
Total: 7 days with snow/sleet falling.
2021/2022 Snow days (approx 850hpa temp):
26/11 (-5), 27/11 (-7), 28/11 (-6), 02/12 (-6), 06/01 (-5), 07/01 (-6), 06/02 (-5), 19/02 (-5), 24/02 (-7), 30/03 (-7), 31/03 (-8), 01/04 (-8)
Total: 12 days with snow/sleet falling.