In reply to Piers Harley:
The non-line of Fallen Block Climb is so indeterminate that anything on that wall gives the tick. All the permutations on the wall had been climbed when I first visited Cattle Troughs in 1969,back then the old boys couldn't remember where the block fell from it was so long ago.
It would make more sense if it was called Fallen Block Wall, in the same way that Bunney's Wall covers a number of variations.