In reply to Cardi:
A group of 4 did climb both stacks and set up a tyrolean. they had someone onthe coastal path waiting to take photos of someone on the tyrolean but it all went pear shaped when the rubber dinghy was over turnned by the incoming tide. 2 of them abbed off to sort out the dinghy. We got bored at this point and went to the pub as it was getting dark.
Talking to someone the following day and it would seem the 2 who saved the dinghy left the 2 on the top who were rescued by helicopter.
So no one has actually done the tyrolean as far as I know.