 Peter FinchJohnnie Byrne | Johnnie Byrne |
 Stanley HollowayFred Andrews | Fred Andrews |
 Mary PeachPauline West | Pauline West |
 Donald PleasenceRenfrew | Renfrew |
 Billie WhitelawMary | Mary |
 Hugh BurdenTim Maxwell | Tim Maxwell |
 Rosalie CrutchleyAlice Byrne | Alice Byrne |
 Michael GoodliffeDr. West | Dr. West |
 Mervyn JohnsCharlie Young | Charlie Young |
 Geoffrey KeenThe Prime Minister - Reginald Stevens | The Prime Minister - Reginald Stevens |
 Paul RogersSydney Johnson | Sydney Johnson |
 Dennis PriceFlagg | Flagg |
 Peter BarkworthHenderson | Henderson |
 Fenella FieldingSheilah | Sheilah |
 Derek FrancisFrank | Frank |
 Gladys HensonMrs. Sarah Arscott - Constituent at Party Meeting | Mrs. Sarah Arscott - Constituent at Party Meeting |
 Conrad PhillipsDrake | Drake |
| MMaureen PryorLabour Party Member | Labour Party Member |
 George RoseEdward Collins | Edward Collins |
 Peter SallisM.P. | M.P. |
| JJack ArmstrongMan Bench by the River Thames (uncredited) | Man Bench by the River Thames (uncredited) |
 John ArnattGregson, BBC Reporter (uncredited) | Gregson, BBC Reporter (uncredited) |
| HHyma BeckleyMP (uncredited) | MP (uncredited) |
| PPaul BeradiMP Smoking on Terrace (uncredited) | MP Smoking on Terrace (uncredited) |
| EErnest BlythMP (uncredited) | MP (uncredited) |
 A. J. BrownSpeaker of the House (uncredited) | Speaker of the House (uncredited) |
 John BlythePub Customer (uncredited) | Pub Customer (uncredited) |
 Avis BunnageConstituent (uncredited) | Constituent (uncredited) |
 Marie BurkeMary's Housekeeper (uncredited) | Mary's Housekeeper (uncredited) |
| JJimmy ChartersMan at Earnley Station (uncredited) | Man at Earnley Station (uncredited) |
