Environmental charity Greenpeace has tweeted this photo of the Shard climbers taking part in a training exercise yesterday. They appear to be using a ladder to climb through a hatch in the roof of a lorry.
The training appears to have been aimed at the first stage of the climb when the protesters emerge from a lorry via a ladder to start the ascent.
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The study is expected to warn of the impacts of melting ice and permafrost.
Some northern and eastern areas may stay bright and warm but heavy rain or showers will affect most parts.
Police used tear gas and rubber rounds against protesters on Saturday