In reply to mark s:
No, no, no, I can't believe I'm typing this even though your sitting on my radiator. He said in his email that it may be 6c, said it was harder than the crux on Counterstroke but couldn't comment whether 6c or 7a as he says he's not done a 7a before.
Either way, doesn't really matter, it's a hard slab with low gear and a grand effort. Jules reckons it would be easier for the tall, good luck Adam!