Shard climbers won't install artwork 'due to timing'

LATEST: The art installation takes 4 hours so the climbers have decided it's not safe to install before it gets dark. #iceclimb

We're still far from certain whether they can make it to the top but they're going to try. #iceclimb

Important to remember this is the first ascent of the Shard. Nobody has ever done this before. There are lots of unknowns. #iceclimb