In reply to Porky:
> A party did it about half an hour before us yet we did not find any chalk on the second pitch.
I'm not sure how much this signifies on that route! I'm pretty sure there wasn't any chalk on the holds I used while my chalky hand was still touching them, the sea grease just gobbled it right up.
Having said that, it's been a couple of years (and I'm not noted for my memory) but I think your description sounds quite different from what I did. I originally quested rightwards into the cave, but changed my mind, retreated and went left, which felt much easier. The slippery laybacking could perhaps be where I retreated from because it was, as hinted at above, extremely slimy.