In reply to hwackerhage:
Henning, I had a look at your photos of the head wall afterwards to check and it looks very different. I got to where your photo shows you moving left, but the wall was plastered in about 40cm of snow that had been through a thaw/freeze, but wasn't firm enough to weight bear. The turf wasn't visible until near the top of the wall. The snow was thicker than I'd expected on a steep wall, wouldn't have held my weight and would have been very time consuming to clear, so I opted for a traverse right from that point for about 15m until I could get to some well frozen turf blobs. Good route, definitely worth a star or two.
Cheers,
Wilf.