| Maurice Harold Macmillan | May 1940 | February 1942 |
| Arthur Woodburn | April 1946 | October 1947 |
| Toby Austin Richard Low | 1951 | 1954 |
| Robert Michael Maitland Stewart | May 1951 | October 1951 |
| Frederick James Erroll | 1955 | 1956 |
| Ian Douglas Harvey | 1956 | 1958 |
| Rt Hon Aubrey Jones | 1957 | 1959 |