This article in the Guardian describes a 3-night trip around the Cairngorms in winter. They only managed one night actual motorhoming, but the locations are described well. I think they must be novices dipping their toes in the water.
My winter campervan adventure in the Cairngorms, Scotland
A slow jaunt around the mountainous national park, on some of the highest roads in Britain, delivers dramatic scenery, frosty walks and ziplining after dark
www.theguardian.com