| Person | Type | Job | Role(s) | Episodes |
|---|---|---|---|---|
 Andrew Lloyd Webber | Crew | Creator | Creator | |
Andrew Lloyd Webber | Cast | Actor | Self - Head Judge | 19 |
 Bill Kenwright | Cast | Actor | Self - Judge | 19 |
 Graham Norton | Cast | Actor | Self - Host | 19 |
 Jason Donovan | Cast | Actor | 4 | |
 John Barrowman | Cast | Actor | Self - Judge | 19 |
 Meat Loaf | Cast | Actor | 1 | |
Zoë Tyler | Cast | Self - Judge | 19 | |
 Josh Groban | Cast | Actor | 2 | |
 Louis Walsh | Cast | Actor | 1 | |
Ben James-Ellis | Cast | Self | 19 | |
 Daniel Boys | Cast | Actor | Self | 19 |
 Helena Blackman | Cast | Actress | 1 | |
 Leon Cooke | Cast | Actor | 1 | |
 Denise Van Outen | Cast | Actress | Self - Judge | 19 |
Lewis Bradley | Cast | Self | 19 | |
 Shakin' Stevens | Cast | Actor | 1 | |
 Lee Mead | Cast | Self | 19 | |
Connie Fisher | Cast | 1 | ||
Keith Jack | Cast | Self | 19 | |
 Johndeep More | Cast | Self | 19 | |
 Ryan Ryder | Cast | Actor | Self | 19 |
Rob McVeigh | Cast | Self | 19 | |
Chris Crosby | Cast | Self | 19 | |
Seamus Cullen | Cast | Self | 19 | |
Antony Hansen | Cast | Self | 19 | |
Chris Barton | Cast | Self | 19 | |
| Person | Type | Job | Role(s) | Episodes |
