Emma Appleton as Thomasina Hanbury

Stefanie Martini as Martha Hanbury

Rory Fleck-Byrne as Lt. Sebastian Holloway

Aaron Monaghan as Major. Henry Cobcroft

Theodora Brabazon Legge as Young Thomasina Hanbury

Francesca Brabazon Legge as Young Martha Hanbury

Eva O'Brien as Teenage Thomasina

Chacha Seigne as Lola Hanbury

Shaun Boylan as Reginald Watson

Neil Hannon as Reginald Watson (voice)

Lorcan Cranitch as Major. General Norbury

Ian Toner as German Soldier at Checkpoint

Michael Hulsmann as German Soldier at Checkpoint (voice)

Hugh O'Conor as Enoch Johnson

Serena Brabazon as Rachel Johnson

Aran Goyb Goyb Murphy as Leo

Ayvianna Snow as Rebecca Cavendish

Nick Dunning as Television Newsreader

William Forrest as Young Reginald Watson

Richard Elfyn as Winston Churchill / Various Voices (voice)

Gerald Tyler as Various Voices (voice)

Hamish Stanfeld as Various Voices (voice)

Philip Condron as Sturmführer Hemplestall

Frank Armstrong as St. Paul's Nazi #1

Matthew McCann as St. Paul's Nazi #2

Melanie Leonard as Reginald Watson's Dancer #1

Ciara Nash as Reginald Watson's Dancer #2

Anja Nicholson as Reginald Watson's Dancer #3

David Bowie as Self - Singer (archive footage)

Adolf Hitler as Self - Politician (archive footage)

Winston Churchill as Self - Politician (archive footage)

Franklin D. Roosevelt as Self - Politician (archive footage)

Oswald Mosley as Self - BUF Leader (archive footage)

Joseph P. Kennedy Sr. as Self - Diplomat (archive footage)

Ian Dillon as German Wermacht Officer (uncredited)