| Eric Samuel Heffer | March 1974 | 1975 |
| James Gregor MacKenzie | June 1975 | April 1976 |
| Alan John Williams | April 1976 | May 1979 |
| Norman Beresford Tebbit | 5 January 1981 | 14 September 1981 |
| Norman Stewart Hughson Lamont | 14 September 1981 | 1985 |
| Peter Hugh Morrison | 1985 | 1986 |
| John Giles Dunkerley Shaw | 1986 | 1987 |