The short steep wall right between 'Central Crack' and 'Parapet Route'.
Start up the small corner as for the latter and move up to an obvious crack. Climb the crack and wall above to a balancy top-out onto the slab (bold). The rest of the pitch is easier albeit a bit licheny. Continue straight up to near the left groove of 'Parapet Route', then step left and back right up a diagonal flake-line to finish directly.