| Episode credited cast: |
 | Graham Norton | - | Himself - Host |
 | Andrew Lloyd Webber | - | Himself - Chief Judge |
| Rest of cast listed alphabetically: |
 | Charlotte Church | - | Herself - Judge |
 | Stephanie Davis | - | Herself - Potential Dorothy |
 | Jenny Douglas | - | Herself |
| Sophie Evans | - | Herself - Potential Dorothy |
| Stephanie Fearon | - | Herself - Potential Dorothy |
| Sarah Fisher | - | Herself |
 | Sheila Hancock | - | Herself - Judge |
| Danielle Hope | - | Herself - Potential Dorothy |
| John Partridge | - | Himself - Judge |
| Lauren Samuels | - | Herself - Potential Dorothy |
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