In reply to paulmo101:
I wouldn't sweat too much about this (especially in August!). It's pretty damn obvious, even in the clag. It's big and often pretty banked. It's the continuation of Sargeant's (which is lower down and leads in to the cwm) - the main line out the back of the cwm.
To the left the only obvious gully I can recall is Sinister Gully, which has a fairly obvious if short (20m) pitch of vertical ice halfway up (and is thus III rather than grade I). I have some photos somewhere but goodness knows where...To the right there's not much gully action apart from Shallow Gully which looks nowhere near as grand as PFG.
Could also look at Banana Gully or Easy Gully in the Glyderau (Y Garn and Cwm Cneifion respectively) for initial explorations...
b