Trailer
Images
 | Peter Finch as Johnnie Byrne |
 | Stanley Holloway as Fred Andrews |
 | Mary Peach as Pauline West |
 | Donald Pleasence as Renfrew |
 | Billie Whitelaw as Mary |
 | Hugh Burden as Tim Maxwell |
 | Rosalie Crutchley as Alice Byrne |
 | Michael Goodliffe as Dr. West |
 | Mervyn Johns as Charlie Young |
 | Geoffrey Keen as The Prime Minister - Reginald Stevens |
 | Paul Rogers as Sydney Johnson |
 | Dennis Price as Flagg |
 | Peter Barkworth as Henderson |
 | Fenella Fielding as Sheilah |
 | Derek Francis as Frank |
 | Gladys Henson as Mrs. Sarah Arscott - Constituent at Party Meeting |
 | Conrad Phillips as Drake |
 | Maureen Pryor as Labour Party Member |
 | George Rose as Edward Collins |
 | Peter Sallis as M.P. |
| Jack Armstrong as Man Bench by the River Thames (uncredited) |
 | John Arnatt as Gregson, BBC Reporter (uncredited) |
| Hyma Beckley as MP (uncredited) |
| Paul Beradi as MP Smoking on Terrace (uncredited) |
| Ernest Blyth as MP (uncredited) |
 | A. J. Brown as Speaker of the House (uncredited) |
 | John Blythe as Pub Customer (uncredited) |
 | Avis Bunnage as Constituent (uncredited) |
 | Marie Burke as Mary's Housekeeper (uncredited) |
| Jimmy Charters as Man at Earnley Station (uncredited) |
 | Donald Churchill as Sheilah's Party Guest (uncredited) |
 | Ernest Clark as M.P. (uncredited) |
| Marian Collins as Pretty Girl (uncredited) |
| George Curtis as Bobby (uncredited) |
| Dan Darnelli as MP (uncredited) |
 | Mark Dignam as Earnley Constituent (uncredited) |
| Rex Garner as MP (uncredited) |
 | Philip Gilbert as Terry Langham (uncredited) |
 | Fred Griffiths as Taxi Driver (uncredited) |
 | Jack Gwillim as MP (uncredited) |
| Victor Harrington as MP (uncredited) |
| Lindsay Hooper as MP (uncredited) |
 | Walter Horsbrugh as House of Commons Archivist (uncredited) |
| Howard Lang as Labour Party Member greeting Johnnie Byrne (uncredited) |
| Aileen Lewis as Woman on Euston Station Platform (uncredited) |
| Jack Mandeville as Dancer in Nightclub (uncredited) |
| Colin McKenzie as Bobby (uncredited) |
 | William Mervyn as Postmaster-General (uncredited) |
 | Philip Ray as M.P - House of Commons Entrance Area (uncredited) |
 | Oliver Reed as Man with Bucket on His Head (uncredited) |
 | Jessie Robins as MP (uncredited) |
 | Norman Rossington as Sykes of the Herald (uncredited) |
| Robert Sansom as Dying Minister (uncredited) |
| Ivan Santon as Man nudges Peter Finch (uncredited) |
| John Sharp as Railway Station Master (uncredited) |
 | Emile Stemmler as MP (uncredited) |
| Jimmy Thompson as Sheilah's Party Guest (uncredited) |
| Joseph Tregonino as Waiter (uncredited) |
 | Yolande Turner as Party Guest (uncredited) |
 | Mona Washbourne as Well-wisher at Train Station (uncredited) |
| Johnny Wyne as MP (uncredited) |
| Directing | |
| Ralph Thomas | Director |
Writing | |
| Wilfred Fienburgh | Novel |
| Nicholas Phipps | Screenplay |
| Mordecai Richler | Screenplay |
Editing | |
| Alfred Roome | Editor |
Production | |
| Betty E. Box | Producer |
