James Corden plays Paul Potts in One Chance, a film about about the Port Talbot opera singer's life.
Corden told ITV News "it's such an uplifting, moving film", which shows how Potts fought "through so much adversity" and realised his dreams, because he refused to give up on them.
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22-year-old Ify Iwobi has been making music since the age of seven.