Having dropped down the second pitch, as referred to above, you end up in a big chamber. At the bottom of chamber are a couple of ways on. It's the left hand one you want, into a fairly unpleasant, damp rift. Just after getting a slight wetting from some water coming in from the roof, the rift widens and up on your left is the "climb". The slot at the top of it is fairly obvious. The way up (for us) not so. In the end we resorted to combined tactics to get one person up and then they secured a rope for the rest of us - it may still be there! Usual caveat about bits of rope you find applies.
It was a great trip though still not quite sure how I got up the waterfalls in Upper Clough's passage.