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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A Met Office warning covering much of England and south-east Wales is expected to remain in place until 11am.
A band of cloud and patchy rain is expected across Scotland and Northern Ireland, moving southeast as the day progresses.