A police officer can be seen in the live video feed from a camera worn by one of the climbers at the top of The Shard. It is not clear whether any of the protesters have been arrested.
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Thames Valley Police named the victims as Savaan Mundae, Jaspal Bahra, Thanh Nguyen and Captain Michael Green.
Mild & wet with winds whipping up
The Chancellor said he will use the Budget to "invest to secure a bright future", in a signal he is ready to usher in the end of austerity.