| Alan James Oddie | Director | 29 Jun 1988 | 1 Apr 1996 | British | 75 years |
| Alexander Daniel Jeffrey | Director | 20 Jul 2012 | 23 Mar 2018 | British | 59 years |
| Anne Helen Richards | Director | 7 Jun 2016 | 10 Aug 2018 | British | 61 years |
| Anthony John Ashplant | Director | 24 Feb 1999 | 23 Mar 2016 | British | 71 years |
| Anthony John Ashplant | Secretary | 18 Jan 1990 | 24 Apr 1996 | British | - |
| Anthony Presley Shearer | Director | 30 Sept 1992 | 15 Jan 1996 | British | 77 years |
| Ashley Gordon Down | Director | 30 Sept 1992 | 24 Jun 1998 | British | 87 years |
| Charles Alan Mclintock | Director | 30 Sept 1992 | 4 Feb 1994 | British | 100 years |
| Clare Jane Bousfield | Director | 22 Aug 2019 | 6 Dec 2021 | British | 57 years |
| David Burdett Money-coutts | Director | 25 Mar 1987 | 29 Jan 1997 | British | 94 years |
| David Gareth Jones | Director | 1 Jun 2007 | 22 Aug 2019 | British | 59 years |
| David Kenneth Watson | Director | 31 Jan 1996 | 28 Feb 2003 | British | 66 years |
| David Leslie Morgan | Director | 16 Jan 1991 | 27 May 1998 | British | 92 years |
| Edward Barry Orton Sherlock | Director | 4 Feb 1994 | 28 Aug 1996 | British | 93 years |
| Edward Louis Rosengarten | Director | 4 Dec 2000 | 28 Oct 2010 | British | 57 years |
| Ewen Cameron Stewart Macpherson | Director | 28 Aug 1996 | 24 Jun 1998 | British | 83 years |
| Gary Nicholas Cotton | Director | 30 Nov 2011 | 25 May 2018 | British | 56 years |
| Gary Paul John Shaughnessy | Director | 15 May 2000 | 31 Oct 2006 | British | 59 years |
| George Ernest Loudon | Director | 31 Mar 1993 | 4 Feb 1994 | Dutch | 83 years |
| Graham David Mason | Director | 23 Feb 2015 | 1 Apr 2018 | South African | 63 years |
| Grant Robert Speirs | Director | 24 Oct 2008 | 1 Apr 2018 | South African | 54 years |
| Harold John Haden | Director | 27 Oct 1982 | 26 Mar 1997 | British | 84 years |
| Hugh Robert Collum | Director | 16 Jan 1992 | 24 Jun 1998 | British | 85 years |
| Jeffrey Stephen Peter Mushens | Director | 15 May 2000 | 7 May 2002 | British | 71 years |
| John Clark Betteridge | Director | 15 May 2000 | 6 Nov 2000 | British | 67 years |
| John Sydney Fairbairn | Director | 30 Sept 1992 | 24 Jun 1998 | British | 91 years |
| John William Foley | Director | 23 Jan 2006 | 30 Jun 2007 | British | 69 years |
| John William Foley | Director | 24 Sept 2012 | 31 May 2016 | British | 69 years |
| Jonathan Peter Mcclelland | Director | 1 Apr 2016 | 7 Sept 2018 | British | 62 years |
| Jonathan Peter Mcclelland | Secretary | 20 Aug 1999 | 1 Apr 2018 | British | - |
| Julian Christopher Gell | Director | 15 May 2000 | 31 May 2007 | British | 74 years |
| Laurence Edward Linaker | Director | 30 Sept 1992 | 27 Jul 1994 | British | 91 years |
| Lee Bullen | Director | 19 Jul 2021 | 5 Aug 2025 | British | 45 years |
| Leslie John Scrine | Director | 15 May 2000 | 30 Nov 2001 | British | 67 years |
| Leslie John Scrine | Director | 1 Mar 2003 | 30 Apr 2012 | British | 67 years |
| Margaret Theodora Zemek | Director | 5 Mar 2001 | 14 May 2002 | American | 70 years |
| Martin Lewis | Director | 26 Feb 1997 | 13 Jun 2016 | British | 69 years |
| Martin Richard Moore | Director | 4 Apr 2006 | 24 Sept 2012 | British | 69 years |
| Matthew Howells | Director | 19 Jul 2021 | 5 Aug 2025 | British | 47 years |
| Michael George Alexander Mclintock | Director | 29 Jun 1994 | 6 Jun 2016 | British | 64 years |
| Michelle Sylvia Scrimgeour | Director | 13 Jun 2012 | 23 Feb 2017 | British | 62 years |
| Neil Michael Donnelly | Director | 22 Feb 2017 | 1 Apr 2018 | Irish | 53 years |
| Nicholas Robert Mcmorran | Director | 1 Apr 2018 | 22 Aug 2019 | British | 51 years |
| Paul David Cooper | Director | 19 Jul 2021 | 25 Apr 2022 | British | 53 years |
| Peter Anthony Emms | Director | 17 May 1993 | 30 Jun 1998 | British | 76 years |
| Philip Charles Wagstaff | Director | 18 Jun 2001 | 30 Jun 2004 | British | 62 years |
| Philip Michael Johnson | Director | 1 Mar 2003 | 12 Sept 2008 | British | 54 years |
| Richard Stormont Hughes | Director | 29 Jun 1994 | 15 May 2000 | British | 68 years |
| Robert Anthony Brooks | Director | 30 Sept 1992 | 31 Jan 1996 | British | 94 years |
| Roddy Thomson | Director | 22 Aug 2019 | 27 Apr 2021 | British | 45 years |
| Roderick David Kent | Director | 8 Feb 1995 | 24 Jun 1998 | British | 78 years |
| Samuel John Morse | Director | 15 May 2000 | 30 Sept 2001 | British | 63 years |
| Sean Andrew Fitzgerald | Director | 4 Apr 2022 | 13 Jan 2025 | British | 60 years |
| Simon Humphrey Westland Pilcher | Director | 15 May 2000 | 1 Apr 2018 | British | 59 years |
| Simon Moffatt | Director | 19 Jul 2021 | 5 Aug 2025 | British | 56 years |
| Stephen Henry Henton | Secretary | 24 Apr 1996 | 20 Aug 1999 | British | - |
| Timothy Peter Francis Miller | Director | 30 Sept 1992 | 12 Oct 1992 | British | 85 years |
| Vivian Paul Bazalgette | Director | 27 Nov 1996 | 30 Sept 2001 | British | 74 years |
| William George Vasilieff | Director | 15 May 2000 | 30 Apr 2001 | British | 70 years |
| William John Nott | Director | 15 May 2000 | 31 Dec 2017 | British | 63 years |
| William Rees Mogg | Director | 30 Sept 1992 | 4 Feb 1994 | British | 97 years |