In reply to Nick_Scots:
I was over at Ben Cruachan yesteray. All the Southern and Central Highlands have snow down to 500 metres. Generally a thin cover - no more than 4-5 inches in the deeper spots, but ice is forming at most levels - so you should find it similar at Tarmachan. Freezing level a bit higher tomorrow - around 700 metres. Getting much colder again for all of next week. Not a lot of snow forecast but conditions should carry on improving. Looks like staying cold well into February