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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Six people were injured after they were hit with the substance during an "altercation" between two groups at a shopping in east London.
Save Your Uber in London was set up after it was announced the firm would not have its licence renewed when it expires next week.
Survivors are still traumatised, homeless and want answers.