A fine route, especially the first pitch up the prominent corner capped by a large roof. Footage of climbers on the route features in the 1977 film A Nice Sort of Day: http://www.nzonscreen.com/title/a-nice-sort-of-day-1977.
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The corner is a little loose, but good gear can be arranged under the roof. Around this and up the top corner to the Regular Rowt belay.
Trend left up the slab into the upper corner (2 pitons), then on to the top of the Pinnacle.