Minor scuffles have taken place between anti-Thatcher protesters and police in Trafalgar Square.
Scotland Yard said they have an "appropriate policing operation" in place.
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Leader Paul Nuttall - who is yet to confirm if he will stand for election - denied policies aimed almost entirely at Muslims were divisive.
When Suray Mohamed left her village she was a wife and mother-of-seven - but just weeks later there is only her left.
The band split up 29 years ago and barely talked since.