 Emma AppletonThomasina Hanbury | Thomasina Hanbury |
 Stefanie MartiniMartha Hanbury | Martha Hanbury |
 Rory Fleck-ByrneLt. Sebastian Holloway | Lt. Sebastian Holloway |
 Aaron MonaghanMajor. Henry Cobcroft | Major. Henry Cobcroft |
| TTheodora Brabazon LeggeYoung Thomasina Hanbury | Young Thomasina Hanbury |
| FFrancesca Brabazon LeggeYoung Martha Hanbury | Young Martha Hanbury |
| EEva O'BrienTeenage Thomasina | Teenage Thomasina |
| CChacha SeigneLola Hanbury | Lola Hanbury |
 Shaun BoylanReginald Watson | Reginald Watson |
 Neil HannonReginald Watson (voice) | Reginald Watson (voice) |
 Lorcan CranitchMajor. General Norbury | Major. General Norbury |
 Ian TonerGerman Soldier at Checkpoint | German Soldier at Checkpoint |
| MMichael HulsmannGerman Soldier at Checkpoint (voice) | German Soldier at Checkpoint (voice) |
 Hugh O'ConorEnoch Johnson | Enoch Johnson |
 Serena BrabazonRachel Johnson | Rachel Johnson |
 Aran MurphyLeo | Leo |
 Ayvianna SnowRebecca Cavendish | Rebecca Cavendish |
 Nick DunningTelevision Newsreader | Television Newsreader |
| WWilliam ForrestYoung Reginald Watson | Young Reginald Watson |
 Richard ElfynWinston Churchill / Various Voices (voice) | Winston Churchill / Various Voices (voice) |
 Gerald TylerVarious Voices (voice) | Various Voices (voice) |
| HHamish StanfeldVarious Voices (voice) | Various Voices (voice) |
 Philip CondronSturmführer Hemplestall | Sturmführer Hemplestall |
| FFrank ArmstrongSt. Paul's Nazi #1 | St. Paul's Nazi #1 |
| MMatthew McCannSt. Paul's Nazi #2 | St. Paul's Nazi #2 |
| MMelanie LeonardReginald Watson's Dancer #1 | Reginald Watson's Dancer #1 |
| CCiara NashReginald Watson's Dancer #2 | Reginald Watson's Dancer #2 |
| AAnja NicholsonReginald Watson's Dancer #3 | Reginald Watson's Dancer #3 |
 David BowieSelf - Singer (archive footage) | Self - Singer (archive footage) |
 Adolf HitlerSelf - Politician (archive footage) | Self - Politician (archive footage) |
