Winston McKenzie, the UKIP candidate for Croydon North, confirmed Nigel Farage would not be turning up because of concerns over safety.
Winston McKenzie said: "He's a responsible family man and political party leader. Certain situations you have to avoid... Croydon is unsafe and a dump."
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A 24-year-old man has been arrested on suspicion of murder after the body washed up on the Thames shoreline.
Seven people have now been arrested after a man died from serious head injuries
The 38-year-old officer was on his way home from a night shift when he collapsed. His death is not being treated as suspicious.