| Gary Barlow |
| Susan Boyle |
| Alexandra Burke |
| Nicki Chapman |
| Charlotte Church (archive footage) |
| Tulisa Contostavlos |
| John Kaye Cooper |
| Simon Cowell |
| Bobby Crush |
| Les Dennis |
| Siobhan Greene |
| Nigel Hall |
| Amanda Holden |
| Jack the Lad Swing - Themselves (as JLS) |
| Bonnie Langford |
| Nigel Lythgoe |
| Jane McDonald |
| Dannii Minogue |
| Piers Morgan |
| Olly Murs |
| Dermot O'Leary |
| One Direction |
| Neil Reid |
| Claudia Rosencrantz |
| Kelly Rowland |
| Joss Stone (archive footage) |
| Connie Talbot (archive footage) |
| Gavin Talbot (Father of Connie) |
| Sharon Talbot (Mother of Connie) |
| Louis Walsh |
| Pete Waterman |
| Victoria Wood - Narrator (voice) |
| Lena Zavaroni (archive footage) |
| Victor Zavaroni (Father of Lena) |