In reply to Tom Last:
Thanks all for the info. We made the drive for the weekend from Cornwall, so genuinely people replying to these threads is very very useful when you're in the position of living so far away.
So to update from Beinn Alligin yesterday. Everything quite wet underfoot still. Light dusting to about 500m then older pack from about 800m, well bonded but only up to about 6" thick for the most part, with a couple inches graupel sat on top. Turf only completely frozen towards the summits hereabouts. Small patches of windslab on all aspects, but nothing extensive enough to give us any great concerns on the ridge. Couldn't see into Deep North/South gullies, but would imagine fairly thin. Eag Dubh etc bare. Pretty good winter walking conditions though, which was what we were after. Similar picture as far north as An'Teallach by the looks of it (from a distance). Thanks again.