More than half a billion pounds has been spent by local authorities in London on emergency housing since the general election. Councils have been forced to place people in accommodation, such as hotels and B&Bs, after they presented themselves as being homeless.
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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.