Daniel Mays as Peter Wildeblood

Richard Gadd as Eddie McNally

Mark Gatiss as Dr. Landers

Charlie Creed-Miles as Superintendent Jones

Richard Dillane as Prosecutor Roberts

Paul Keating as Fanny

Mark Edel-Hunt as Edward Montagu

David Robb as Lord Wolfenden

Josh Collins as Michael Pitt-Rivers

Daniel Betts as Defense Rawlinson

Timothy Watson as Clerk of Assize

Barney White as Dan Starling

James Gaddas as Governor Cockayne

Claire Bond as Iris

Matthew Canny as John Reynolds

Mark Holgate as Tony

David Watson as Radio Announcer (voice)