In reply to static266:
Ah, I did it once to extend the horseshoe a bit.
It's a bit vague, only trod 'path' for about a tenth of it. Wouldn't want to do it for the first time in the mist! Looks obvious from Pen-y-pass, but not so much once you're there.
The North ridge is great.
edit, I may have gone at a higher level than what you describe.(?)
Post edited at 18:02