Coaches and trains on their way now from across the UK carrying marchers against austerity. Tweet us your messages and pictures #oct20
Lots of activity in London; the Unite band is relaxing ready for later
More top news
Fire service confirms that two buildings have collapsed in an explosion thought to have been caused by a gas leak.
Famous global landmarks fell dark for 60 minutes to mark Earth Hour, a campaign urging awareness and action on climate change.
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