In reply to Harry Jarvis:
> Presumably it is just a question of picking the most attractive looking line?
Yes, it's fine, a bit stony, but less loose scree than the normal route. You can make a nice round over Sgorr nan Lochan Uaine: there is a straightforward grassy descent from the first col heading east from the summit of BLM to the eastern outflow from Lochan Uaine.
Post edited at 17:18