| Rt Hon Richard Frederick Wood | June 1970 | March 1974 |
| Rt Hon Judith Constance Mary Hart, Baroness Hart of South Lanark | March 1974 | June 1974 |
| Frank Ashcroft Judd | December 1976 | February 1977 |
| Rt Hon Judith Constance Mary Hart, Baroness Hart of South Lanark | February 1977 | May 1979 |