Participants in yesterday's anti-badger cull protests were reportedly seen chasing BNP supporters down London's Whitehall, reports the International Business Times.
The BNP and EDL march was opposed formally by activists from groups including Unite Against Fascism and Hope Not Hate.
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Temperatures are predicted to reach a high of 23C.
Hunt accused companies of "turning a blind eye" to a generation of children "exposed to harmful emotional side effects" of social media.
Top temperature 24C/75F.