In reply to Dave Cundy:
The climber in the photo is not on Last Slip. If you look down and right of the climber, you can see a small overhang (not the one crossed by the climber's ropes) with a seam (looks like a thin crack) starting on the left hand side of it and going up for a bit. Last Slip pulls over the left hand side of that overhang and continues up the groove above it. The right wall of the groove looks smooth in the photo, and has small bushes peeking over its right hand edge. Hope this helps