In reply to Stuart the postie:
> Something to consider, with these cold temps and no snow lying, springs most likely freeze at source.
I've little experience of Udlaidh (it was wonderful when I went there) but I've seen exactly this elsewhere - often the best ice comes from seeps rather than actual flowing streams/waterfalls as to much velocity makes it hard to freeze, whilst seeping water freezes more readily. But no snow and cold temperatures and it can freeze at source and not really have time to seep down the rock before freezing.
If it stays cold, I guess actual streams/waterfalls might be worth a look first. Now, down here in Derbyshire, can anyone think of an actual waterfall that has a reasonable flow rate, perhaps fed by a small river above that is unlikely to freeze before the fall...?