| Alan James Oddie | Director | 30 Sept 1992 | 1 Apr 1996 | British | 75 years |
| Alison Morris | Director | 15 Apr 2020 | 6 Sept 2024 | British | 66 years |
| Anne Helen Richards | Director | 7 Jun 2016 | 10 Aug 2018 | British | 61 years |
| Anthony John Ashplant | Director | 24 Feb 1999 | 15 May 2000 | British | 71 years |
| Anthony John Ashplant | Director | 1 Mar 2003 | 23 Mar 2016 | British | 71 years |
| Anthony John Ashplant | Secretary | 30 Sept 1992 | 24 Apr 1996 | British | - |
| Anthony Presley Shearer | Director | 30 Sept 1992 | 15 Jan 1996 | British | 77 years |
| Ashley Gordon Down | Director | 30 Sept 1992 | 13 Jan 1999 | British | 87 years |
| Beatrice Hannah Millicent Hollond | Director | 1 Apr 2016 | 30 Jun 2020 | British | 65 years |
| Beverley Cliffe Hodson | Director | 26 Oct 1998 | 28 Apr 1999 | British | 74 years |
| Charles Alan Mclintock | Director | 30 Sept 1992 | 4 Feb 1994 | British | 100 years |
| Chris Chaloner | Director | 7 Aug 2020 | 2 Sept 2025 | British | 67 years |
| Clare Jane Bousfield | Director | 7 Feb 2019 | 1 Oct 2021 | British | 57 years |
| Colin Denis Keogh | Director | 1 Apr 2016 | 16 Apr 2020 | British | 72 years |
| David Burdett Money-coutts | Director | 30 Sept 1992 | 29 Jan 1997 | British | 94 years |
| David Kenneth Watson | Director | 31 Jan 1996 | 15 May 2000 | British | 66 years |
| David Kenneth Watson | Director | 30 Nov 2000 | 28 Feb 2003 | British | 66 years |
| David Leslie Morgan | Director | 30 Sept 1992 | 27 May 1998 | British | 92 years |
| Derek Alan Higgs | Director | 28 Apr 1999 | 30 Nov 2000 | British | 81 years |
| Edward Barry Orton Sherlock | Director | 4 Feb 1994 | 28 Aug 1996 | British | 93 years |
| Ewen Cameron Stewart Macpherson | Director | 28 Aug 1996 | 13 Jul 1999 | British | 83 years |
| George Ernest Loudon | Director | 31 Mar 1993 | 4 Feb 1994 | Dutch | 83 years |
| Grant Robert Fairlie Speirs | Director | 1 Nov 2008 | 31 Jan 2019 | British | 54 years |
| Harold John Haden | Director | 30 Sept 1992 | 26 Mar 1997 | British | 84 years |
| Hugh Robert Collum | Director | 30 Sept 1992 | 26 Oct 1998 | British | 85 years |
| John Sydney Fairbairn | Director | 30 Sept 1992 | 28 Apr 1999 | British | 91 years |
| John William Foley | Director | 22 Nov 2017 | 1 Sept 2021 | British | 69 years |
| Jonathan Mark Brewis Daniels | Director | 1 Sept 2021 | 4 Apr 2023 | British | 62 years |
| Jonathan Peter Mcclelland | Secretary | 20 Aug 1999 | 9 May 2018 | British | - |
| Laurence Edward Linaker | Director | 30 Sept 1992 | 27 Jul 1994 | British | 91 years |
| Margaret Mary Ammon | Director | 27 Mar 2018 | 17 Oct 2019 | British | 58 years |
| Martin Lewis | Director | 26 Feb 1997 | 15 May 2000 | British | 69 years |
| Michael George Alexander Mclintock | Director | 29 Jun 1994 | 6 Jun 2016 | British | 64 years |
| Michael Jonathan Evans | Director | 1 Oct 2018 | 1 Apr 2021 | British | 64 years |
| Michelle Sylvia Scrimgeour | Director | 1 Apr 2016 | 23 Feb 2017 | British | 62 years |
| Paul Rodney Marsh | Director | 26 Oct 1998 | 28 Apr 1999 | British | 78 years |
| Penelope Jane Woodcock | Secretary | 25 Nov 2020 | 14 Jul 2021 | - | - |
| Peter Anthony Emms | Director | 17 May 1993 | 30 Jun 1998 | British | 76 years |
| Philip John Remnant | Director | 1 Apr 2016 | 1 Oct 2018 | British | 71 years |
| Philip Michael Johnson | Director | 17 May 2004 | 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 |
| Roderick David Kent | Director | 8 Feb 1995 | 13 Jul 1999 | British | 78 years |
| Sean Andrew Fitzgerald | Director | 1 Oct 2021 | 13 Jan 2025 | British | 60 years |
| Sharna Ludlow | Secretary | 12 Dec 2018 | 25 Nov 2020 | - | - |
| 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 |
| Tracey Jane Spevack | Secretary | 9 May 2018 | 12 Dec 2018 | - | - |
| Vivian Paul Bazalgette | Director | 27 Nov 1996 | 15 May 2000 | British | 74 years |
| William Rees Mogg | Director | 30 Sept 1992 | 4 Feb 1994 | British | 97 years |