In reply to Geoff F:
I've gone up further to the right and left there isn't too much in it. Just try and be sure you are heading up towards the right feature ( that's the most important bit. I've seen people on shackle route that thought it was agags!!!). You can either head up more directly towards crowberry ridge and traverse in to the left or go up the start of curved ridge way. Don't worry too much as the scrambling is in the main pretty straight forward which ever way you go to the base of rannoch wall. I remember thinking when we did the more direct way that it was a bit faster.
You should be able to get a couple of routes done in a day. Either couple with January Jigsaw or you could consider doing North Face Route traversing across to Rannoch Wall to get the full value of climbing the buchaille from the bottom to the top on rock. Its fairly normal to finish by topping out on crowberry ridge at a scramble but there has been a post recently about some loose rock up there so you may want to be careful.
https://www.ukclimbing.com/forums/t.php?t=666209&v=1#x8589115
Post edited at 19:21