| Waldorf Astor | 1918 | 1919 |
| Charles Albert McCurdy | 1919 | 1920 |
| Alan Tindall Lennox-Boyd | 1939 | 1940 |
| Florence Gertrude Horsburgh | 1939 | 1940 |
| Robert John Graham Boothby | May 1940 | January 1941 |
| Florence Gertrude Horsburgh | 1945 | 1945 |
| Frederick Thomas Willey | April 1950 | October 1951 |