Watch the trailer for Paul Potts film One Chance

One Chance follows opera singer Paul Potts as a youngster growing up in Port Talbot and being bullied at school, meeting his future wife Julie-Ann, and working at a mobile phone store in Bridgend.

It shows how close he came to not even auditioning for Britain's Got Talent, back in 2007.

He was filling in an application form for the ITV show online and, struck with doubt, eventually flipped a coin to decide whether to enter.

Of course he went on to wow the judges with a performance of Nessun Dorma at his audition in Cardiff, and won the first series of the talent contest.

Watch: ITV Cymru Wales' programme on the Paul Potts story - Time of Your Life

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UK premiere for Paul Potts film

A film about the life of Paul Potts, a mobile phone salesman from Port Talbot who went on to win the first series of Britain's Got Talent as an opera singer, has had its UK premiere. One Chance stars James Corden as Potts.