- Jack Lowden
- Siegfried Sassoon
- Thom Ashley
- Hamo Sassoon
- Orlando Jopling
- Conductor
- Christopher Naylor
- Tailor
- Geraldine James
- Mother
- Simon Russell Beale
- Robbie Ross
- Peter Capaldi
- Siegfried Sassoon (Older)
- Richard Goulding
- George Sassoon
- Jude Akuwudike
- Priest
- Daniel Tuite
- Major McCartney-Filgate
- Mark Oosterveen
- First Army Doctor
- Steven Pacey
- Second Army Doctor
- Julian Sands
- Chief Medical Officer
- Joyce Henderson
- Matron
- Ben Daniels
- Dr. Rivers
- Matthew Tennyson
- Wilfred Owen
- Torquil Munro
- Pianist
- Chrissy Roberts
- Female Singer
- Bobby Robertson
- Taxi Driver
- Suzanne Bertish
- Lady Ottoline Morrell
- Georgina Rylance
- Dorothy Brett
- Luke Hornsby
- Screaming Man
- Joanna Bacon
- Lady Sybil Colefax
- Jeremy Irvine
- Ivor Novello
- Tom Blyth
- Glen Byam Shaw
- Lia Williams
- Edith Sitwell
- David Shields
- Alexander Fenton
- Kate Phillips
- Hester Gatty
- Calam Lynch
- Stephen Tennant
- James Keefe
- Pianist
- Harry Brown
- Trombonist
- Justin Quin
- Banjoist
- Jay Phelps
- Trumpeteer
- Mark O'Brien
- Saxophonist
- Andrew Bradley
- Stage Doorman
- Harry Lawtey
- Bobby Andrews
- Anton Lesser
- Stephen Tennant (Older)
- Jonnie Broadbent
- Robert Graves
- Gemma Jones
- Hester Sassoon (Older)
- Olivia Darnley
- Edith Oliver
- Edward Bennett
- T.E. Lawrence
- Edmund Kingsley
- Rex Whistler
- Tim Delap
- Geoffrey Keynes
- Chris Dale
- Anglican Priest
- Kellie Shirley
- Singing Girl
- Ian Beach
- Amputee Soldier
- Ben Davis-Kenneth
- Audience Member
- Jamie-Lee Beacher
- Nurse
- Stacey Lynn Crowe
- Nurse
- Kerry Frater
- Cocktail party guest and Theatre attendee
- Richard Price
- Pretty Young Thing Dancer
- Giovanna Ria
- Nurse
- Paddy Rowan
- Young Soldier
- Ben Ryan-Steele
- English and German Soldier
- Ernest Vernon
- Waiter
