James Corden
Paul Potts
Alexandra Roach
Julz
Julie Walters
Yvonne
Colm Meaney
Roland Potts
Jemima Rooper
Hydrangea
Mackenzie Crook
Braddon
Trystan Gravelle
Matthew
Sion Tudor Owen
Choirmaster
Alex Macqueen
Dr. Thorpe
Miriam Lucia
Signora Fiorentino
Stanley Townsend
Luciano Pavarotti
Di Botcher
Nurse
Jon Wennington
Talent Show Punter (uncredited)
Owen Hunte
Friend in Bar (uncredited)
