Water regulator Ofwat says it will challenge a request to raise water bills in the capital by 8% next year.
The request by Thames Water could see the average annual bill rise by nearly £30 if it goes ahead.
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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.