In reply to pancakeandchips:
I did it early in a season when the snow/ice towards the top was very easy. Barely Scottish III, right hand exit, rock belays and runners, firm neve, a slight steepening towards the top but not at all taxing. So day two went fine. (We'd bivvied.)
Day one: not so much. After the first, easy scrambling bits, there was ice in the cracks, ice plating the walls of a series of rocky corners, and two slab pitches that felt scary and unprotected with snow on most of the holds. It felt like Scottish V, mixed. Significantly harder than routes with a higher grade I've done in winter, such as the Swiss on the Courtes (Scottish III/IV?) or the Gabarrou-Albinoni (also no more than IV, with excellent rock protection).