Actor James Cordon plays Britain's Got Talent winner, opera singer Paul Potts in a new film; One Chance. He told Lucrezia Millarini that he asked director David Frankel why he wanted to make the film.
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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.