In reply to iamaclimber:
Hi, I've only done Nethermost east ridge in summer. The winter ascent will obviously differ depending on the snow conditions. There's a lot of neve and ice about in places on the fells at the moment, as well as a lot of powder and unconsolidated snow on top of neve and ice, so it will be unstable in places. Conditions are very variable within a short distance.
In summer, once the gem of Hard Tarn is passed it becomes very steep with a final very narrow horizontal arête, which is short, but as good as anything on Striding Edge with steeper slopes on either side. Not a place to fall off! I can imagine it would be an excellent grade 1 winter route.
Hope this helps.