Victoria Henry, currently one of six Greenpeace activists climbing exterior of The Shard, says the team has nearly reached the top of the building.
Update. Still safe, still hanging on. Not gonna lie, it's exhausting. Into final stretches now #iceclimb
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The PHE will review the evidence and also make recommendations on how to address the issue, according to health officials.
The Commons Public Accounts Committee (PAC) said at least £9 million has been squandered on a project that failed to deliver.
A top temperature of 11 Celsius (52 F).