 Michael RedgraveCharles MacIver | Charles MacIver |
 Valerie HobsonMary Ann Morison | Mary Ann Morison |
 Griffith JonesDavid MacIver | David MacIver |
 Hartley PowerSamuel 'Sam' Cunard | Samuel 'Sam' Cunard |
 Margaretta ScottSusan Donaldson | Susan Donaldson |
 Bessie LoveBegonia Baggot | Begonia Baggot |
 Milton RosmerGeorge Burns | George Burns |
 Frederick LeisterJames Morison | James Morison |
 Henry OscarJosiah Eagles | Josiah Eagles |
 Edmund WillardRobert Napier | Robert Napier |
 Charles VictorTim Grogan | Tim Grogan |
| FFrank TickleMr. Donaldson | Mr. Donaldson |
 Leslie BradleyHoratio Stubbs | Horatio Stubbs |
 Felix AylmerBank President | Bank President |
 Joss AmblerDr. Lardner | Dr. Lardner |
 Ian McLeanCapt. Woodruff | Capt. Woodruff |
| JJoe CunninghamCapt. Slade | Capt. Slade |
 John SalewHenry | Henry |
| HHélène BurlsMinor Role (uncredited) | Minor Role (uncredited) |
| AArthur GoulletMinor role (uncredited) | Minor role (uncredited) |
 James HarcourtMinor role (uncredited) | Minor role (uncredited) |
| RRoddy HughesMinor role (uncredited) | Minor role (uncredited) |
| HHarry LaneMinor role (uncredited) | Minor role (uncredited) |
| JJean LesterMinor role (uncredited) | Minor role (uncredited) |
 Aubrey MallalieuMinor role (uncredited) | Minor role (uncredited) |
 Princess MargaretPrincess Margaret (archive footage) | Princess Margaret (archive footage) |
 Elizabeth II of the United KingdomPrincess Elizabeth (archive footage) | Princess Elizabeth (archive footage) |
 Queen Elizabeth the Queen MotherThe Queen Mother (archive footage) | The Queen Mother (archive footage) |
 Ian WilsonExtra (uncredited) | Extra (uncredited) |
