Global warming all those years ago, there we were claiming it was a modern ideal.robjones said:a tiny ephemeral corrie glacier may have subsisted there as late as 1810", and Moran states it is "the most likely spot in Britain for glacier regeneration" but pessimistically states that if present warming trends continue "Scotland's mountain winter would be but a fond memory in a hundred years' time".
I recall reading something, somewhere, that a small drop in temperature would result in year round snow/ice in the Cairngorms (at probably the above cited example). Personally I've had more problems getting to a cave due to snow than actually in it...