In reply to Douglas Griffin:
Hi Doug,
Bad news that someone was injured. I hope they are OK as well.
My preference is to time it when the worst of the cornices have gone, but there's still enough snow in the gully or face so that it's worth skiing (and safely). This year, a lot of the entries to the gullies are steeper than normal, with big cracks behind, so not ideal.
I have on occasions taken a short rope with me, so that I can anchor myself when I need to check out an entry to a gully. This can be useful to find out whether there is just a slope below, or a void. The rope needs to be longer this year though due to the build up of snow!
There are still some huge cornices around Lochnagar, but the trick is to find an amenable entry point. Central Gully and Black Spout are popular this year. Both have breaks in the cornices, and both were done today as well I gather. Black Spout has a relatively easy entry on the left (so, climbers right) right now, as is usually the case when the winds have generally been from the SW. No need to stand on any cornices or get over any cracks to ski into the gully. Incidentally, it's also the most full of snow I've ever seen it.