In reply to zarathustra:
Far more likely to have good snow cover at Glenmore Lodge than at Plas y Brenin.
March can be a good time of year for snow in Scotland, though occasionally there's not much. It would be a rare year that there wasn't enough to enjoy a winter skills course though, the folk running the course will know all the likely spots.
Wales is more of a lottery.
Post edited at 22:22