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.
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.
A film depicting the real-life story of opera phenomenon Paul Potts' rise to fame gets its UK premiere tonight in London.
James Corden plays the Britain's Got Talent winner in a journey from Port Talbot to the final of the ITV talent show.
Many scenes were filmed on location in Port Talbot.
Potts was working in a mobile phone shop in Bridgend when he auditioned for Britain's Got Talent.
The film, produced by Britain's Got Talent's judge and music mogul Simon Cowell, stars Julie Walters and Colm Meaney. Former Pobl y Cwm actress Alexandra Roach plays his girlfriend.
One Chance is in cinemas from 25 October.
Still has not sunk in yet, but our dream would not have come true without all our fans support. Thank you all x x x
Their debut album 'The Impossible Dream' knocked X Factor star Jahmene Douglas off the top spot.
Two brothers from Flintshire are preparing to go up against a group of super - young, super - energetic dancers from Port Talbot plus a few other acts in the finals of Britains Got Talent.
The singing double-act Richard and Adam and the twinkle toed tiny tots Pre-Skool will be flying the Welsh flag for us.
Rob Shelley reports.
Port Talbot dance troupe, Pre Skool are the second Welsh act to make it through to this year's Britain's Got Talent finals. The youngsters won the judges' vote to join Richard and Adam Johnson in next week's finale.
Singer Robbie Kennedy, from Cwmbran, also performed on Thursday's live semi-finals but failed to make it through.
Two welsh singers from Holywell said they are "absolutely made up" to be through to the finals of Britain's Got Talent.
Richard and Adam Johnson won the public vote in the live semi-final last night.
Speaking to Daybreak this morning, the brothers said : "We never in a million years thought we'd be able to get to where we are."
Richard and Adam Johnson from Holywell are through to the Britain's Got Talent finals. The brothers won the public vote on Monday night's first live semi-final for their rendition of 'Somewhere' from musical West Side Story.
Speaking to hosts Ant and Dec, the brothers said making the final meant "so much" to them after working hard over the last couple of years.