In reply to Colin Moody:
Thanks Colin. That was not the buttress we climbed.
Anyone got any other suggestions? We started up a crack and then another steeper, with one relatively difficult move, then moved right to a small pinnacle and back left on ledges to the top. Behind the top of the buttresss was a deep cleft ,so we were on a pinnacle of sorts, which needed to be stepped across. It brought us out right next to a cairn which marks the SE-most part of the summit plateua, a few hundred metres from the summit and a few metres below it.
Post edited at 16:10