In reply to 1philjones1:
Good choice. Read the latest forum with regards to descent. Best to ab down the N side of the final buttress on bolts rather than climb down to the snow at the toe of the ridge. Crossing back across the snow in order to get back to the bergschrund is an awful gravel ice path, terrifying... We didn't find the bolts, obviously, but the abseil is approximately vertically above the high point where the snow ridge on the N side meets the N face of the final buttress. From here descend to the bergshrund which is a jump across, be bold and take ice screws to protect.
Also don't be tempted by the Dent du Geant, the rock falls from that are pretty continuous and some people have been caught out as the snow cover necessary to approach isn't there.