A rapper from Lewisham has released a single to support the campaign to save Lewisham Hospital's Accident and Emergency unit.
The video for Save Lewisham A&E by Question includes footage of a demonstration that attracted 25,000 people.
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British Transport Police confirmed the trio have been charged with obstructing trains or carriages on the railway by an unlawful act.
The white hedgehogs were found huddled up in a cardboard box with newspaper and a fleece.
The demonstration, dubbed #OperationShutdown, saw supporters initially gather near Downing Street.