Update - 22nd August
My knee is getting better, but very slowly. Having visited the doctor at Laggan Bridge (himself a walker who knew something about the watershed of Scotland), I am now resting for a further few days to see whether progress is sufficient to allow me to continue. If it's not possible to hike by next week, I'll be looking at curtailing the walk and continuing at some date in the future… But I'm still hoping that won't be the case. Now staying in Newtonmore.