| Timothy John Smith | 20 October 1995 | |
| John Daniel Wheeler | 2 May 1997 | |
| David James George Hennessy, Baron Windlesham | 1972 | 1973 |
| David Arthur Russell Howell | 1972 | 1974 |
| Henry Paul Guinness Channon | March 1972 | November 1972 |
| Rt Hon Stanley Orme | March 1974 | April 1976 |
| Roland Dunstan Moyle | June 1974 | September 1976 |
| Michael James Hugh Alison | May 1979 | 14 September 1981 |
| Rt Hon John Paul Stanley | 1987 | 1988 |
| Bernard Harold Ian Halley Stewart | 25 July 1988 | 25 July 1989 |
| Rt Hon Sir John Ambrose Cope | 1989 | 1990 |
| Dr Brian Stanley Mawhinney | November 1990 | 11 April 1992 |
| Michael Andrew Foster Jude Kerr, Earl of Ancram | 1994 | 2 May 1997 |
| Paul Peter Murphy | May 1997 | 28 July 1999 |
| Adam Paterson Ingram | 5 May 1997 | 11 June 2001 |
| Jane Elizabeth Kennedy | 11 June 2001 | 2 April 2004 |
| Barry Strachan Gardiner | 5 April 2004 | 9 May 2005 |
| Robin Caspar Walker | 26 July 2019 | 16 September 2021 |
| Conor David Burns | 16 September 2021 | 7 September 2022 |