| Denis Herbert Howell | October 1964 | October 1969 |
| Eldon Wylie Griffiths | October 1970 | 1974 |
| Hector Seymour Peter Monro | May 1979 | September 1981 |
| David Neil Macfarlane | September 1981 | September 1985 |
| Richard Patrick Tracey | 7 September 1985 | 13 June 1987 |
| Colin Berkeley Moynihan | 22 June 1987 | 26 July 1990 |
| Sir Robert James Atkins | 1990 | 11 April 1992 |