In reply to Jamie B:
"OS maps are utterly useless in the Cuillin,"
I once said something similar whilst sat on the summit of Sgurr Alasdair.....only for the woman sat nearby to declare "oi, I drew that map!!" Awkward...
...but led to an interesting conversation about the SMC map (do they still do that?), an insight into OS map drawing (in the late 80s), and a reminder that I've always suspected that I would have been very happy with a career as a cartographer.