| William Francis Deedes | October 1954 | December 1955 |
| John Enoch Powell | December 1955 | January 1957 |
| Aubrey Geoffrey Frederick Rippon | 1961 | 1962 |
| Edward Delaval Henry Astley, Baron Hastings | 1962 | 1964 |
| James Eugene MacColl | 1964 | 1969 |
| Robert Joseph Mellish | October 1964 | August 1967 |
| Reginald Yarnitz Freeson | October 1969 | June 1970 |
| Rev John Cyril Edmondson, Baron Sandford | 1970 | 1973 |
| Henry Paul Guinness Channon | June 1970 | October 1970 |
| Eldon Wylie Griffiths | June 1970 | October 1970 |