Kim Wilde caused a Twitter sensation when she was recorded on her way home from a Christmas party singing her hit "Kids in America" in December 2012.
Credit: Katherine Eames on YouTube
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The family said the three years the court cases have dragged on have not allowed them to mourn his death properly.
Witnesses told ITV News a brawl broke out in the crowd after hecklers shouted racist abuse at the 74-year-old soul singer.
The figures were obtained by a Freedom of Information requests by Caroline Pidgeon, Liberal Democrat London Assembly transport spokesperson.