In reply to niallk:
No.
We were fairly tired. I had initially tried going in the other direction only to discover myself crawling through the inside of the cornice and deciding that this was a no no sent Nick to look in the other direction. This proved equally unfortunate so we had a brief debate about what to do - Ab off or spend the night.
We decided to camp out, climbing on a 50m single meant the 300m retreat did not look all that attractive whilst knackered in the dark.
We had a blizzard bag and a 2 man bothy bag between us, so chopped the foot off the blizzard bag and each got in then popped the bothy bag over the top.
A warm but sweaty and cramped night ensued, and we abseiled off the next morning. When we made it back to the tent ( A brand new Quasar) we found that it had been destroyed by strong winds in the valley which we were unaware of under the cornice.
now wonder about digging a way out - but the cornice was massive and I assumed at the time it was a dangerous game that would be very tiring and take forever.