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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Drivers belonging to the RMT union are due to walkout at 9.30pm on Saturday in a dispute over a sacked colleague.
A new opinion poll gives the party an increased lead at the expense of the Greens.
The Rail Minister said it was not a matter of crowd control but passengers "trying to get home after a long day at work".