| Thomas Lough | 1905 | 1908 |
| Rt Hon Thomas McKinnon Wood | April 1908 | November 1908 |
| Dr Christopher Addison | 1914 | 1915 |
| Rt Hon John Herbert Lewis | 1915 | 1922 |
| Morgan Jones | 1924 | 1924 |
| Arabella Susan Lawrence | 1924 | 1924 |
| Katherine Marjory Stewart-Murray | 1924 | 1929 |
| Morgan Jones | 1929 | 1931 |
| David Rhys Grenfell | June 1929 | August 1931 |
| Rt Hon Sir Howard Kingsley Wood | 1931 | 1931 |
| Kenneth Martin Lindsay | 1937 | 1940 |