James Corden character Paul Potts
Alexandra Roach character Julz
Julie Walters character Yvonne
Colm Meaney character Roland Potts
Jemima Rooper character Hydrangea
Mackenzie Crook character Braddon
Trystan Gravelle character Matthew
Sion Tudor Owen character Choirmaster
Alex MacQueen character Dr. Thorpe
Miriam Lucia character Signora Fiorentino
Stanley Townsend character Luciano Pavarotti
Di Botcher character Nurse
