As expected, Met Office issue yellow warnings for snow and ice for large parts of Scotland.
https://www.metoffice.gov.uk/public/weather/warnings#?date=2019-01-21
Latest update from MWIS:
PLANNING OUTLOOK
All mountain areas of Britain from Tuesday 22nd January 2019
The colder conditions will continue across the mountains over the next week or fortnight - perhaps longer. Mountain temperatures will frequently be sub-freezing, often to lower slopes in Scotland, although from Thursday to Sunday this week, there will be cycles of freeze and thaw Scottish Highlands, whilst elsewhere, summit temperatures will most often be above freezing point. Precipitation wise, there will be further snow, albeit some melting periods later this week. Next week, there may well be extensive fresh snowfall, substantial in some areas.