| Aubrey Geoffrey Frederick Rippon | 1959 | 1961 |
| Christopher Montague Woodhouse | October 1961 | July 1962 |
| Basil Reginald Vincent Ziani de Ferranti | July 1962 | December 1962 |
| Sir Harry Neil Marten | December 1962 | October 1964 |
| John Thomson Stonehouse | October 1964 | April 1966 |
| David Ernest Campbell Price | October 1970 | 1971 |