Route Grade Votings
12m. From the gully right of the buttress, balance left above the roof then climb the wall to a good ledge. Gain the undercut upper wall with difficulty and climb this to an exit round the rocking block that caps the wall.
I'm not sure what grade this is as I backed off, but it's definitely not HS 4b! At least VS 4b, judging by comments from others it could well be HVS 4c.