In reply to Andy Nisbet: It was thick yesterday, possibly do-able but hollow and, as you say, unlikely to be protectable. The scariest part looked to be stepping from the cone at the base onto the icicle proper. If you can manage that, there's a bit of the stance on the left after a few metres, to get yourself together.
A large part fell from the bottom later in the afternoon, and you could see it was hollow inside. Thankfully, that was enough to put Ally Baba off from giving it a go!