Rebecca Hall character Florence Cathcart
Dominic West character Robert Mallory
Imelda Staunton character Maud Hill
Isaac Hempstead-Wright character Tom
Lucy Cohu character Constance Strickland
Cal Macaninch character Freddie Strickland
John Shrapnel character Reverend Hugh Purslow
Diana Kent character Harriet Cathcart
Richard Durden character Alexander Cathcart
Alfie Field character Victor Parry
Tilly Vosburgh character Vera Flood
Ian Hanmore character Albert Flood
Andrew Havill character George Vandermeer
Anastasia Hille character Dorothy Vandermeer
Joseph Mawle character Edward Judd
Shaun Dooley character Malcolm McNair
Steven Cree character Sergeant Evans
Felix Soper character Julian Dowden
Sidney Johnston character John Franklin
Spike White character Alistair Howell
Charlie Callaghan character Chris Hartley
James Kirkham character William Ramsbottom
Ewan Andrew Walker character Richard McGorian
Adam Thomas Wright character Max Tebbitts
Ben Greaves-Neal character Child Impostor
Daniel Pirrie character Captain Mills
Nicholas Amer character Edgar Hirsthwit
Nick Murphy character Teacher 1
Vera Horton character 1920's Lady (uncredited)
Neil Broome character School Master (uncredited)
