| Adam Piers Gosnold | Director | 2 Apr 2003 | 1 Apr 2021 | British | 63 years |
| Alain Hubertus Philomena Loosveld | Director | 1 Jan 2017 | 11 Sept 2019 | Dutch | 58 years |
| Charles Baird Morrison | Director | 2 Apr 2003 | 30 Dec 2016 | British | 75 years |
| David Charles Turner | Director | 10 Sept 2002 | 2 Apr 2003 | Other | 66 years |
| David Charles Turner | Secretary | 10 Sept 2002 | 24 Feb 2006 | Other | - |
| David Rolfe Tydeman | Director | 13 Oct 2004 | 7 Jul 2006 | British | 71 years |
| Geoffrey Arthur George Shepheard | Secretary | 23 Aug 2004 | 7 May 2008 | British | - |
| Gerard Francis Shannon | Director | 31 Aug 2012 | 21 Aug 2015 | British | 54 years |
| Henry Hunter Sinclair | Director | 2 Apr 2003 | 1 Nov 2003 | British | 82 years |
| Ian Vincent Cusden | Director | 2 Apr 2003 | 23 Dec 2019 | British | 69 years |
| Ian Vincent Cusden | Secretary | 7 May 2008 | 23 Dec 2019 | British | - |
| Ilaria Evans | Secretary | 15 Sept 2022 | 20 Nov 2023 | - | - |
| James Michael Arnold | Director | 2 Apr 2003 | 1 Jan 2023 | British | 61 years |
| James Michael Hobson | Director | 1 Apr 2021 | 31 Oct 2024 | British | 49 years |
| James Robert Winnicott | Director | 2 Apr 2003 | 28 Feb 2023 | British | 58 years |
| Jeremy Harrison | Director | 1 Nov 2003 | 1 Apr 2021 | British | 62 years |
| John Douglas Wilson | Director | 11 Sept 2019 | 1 Apr 2021 | British | 47 years |
| John Francis Coyne | Director | 2 Apr 2003 | 31 Aug 2012 | British | 77 years |
| John Mark Edwards | Director | 5 Oct 2016 | 27 Feb 2023 | Welsh | 60 years |
| Martin Geoffrey Beesley | Director | 10 Dec 2014 | 22 Oct 2021 | British | 60 years |
| Michael William Harrison | Director | 2 Apr 2003 | 1 Jul 2019 | British | 71 years |
| Michael William Standen | Director | 5 Oct 2016 | 15 Sept 2022 | British | 59 years |
| Nigel Howell | Director | 26 Jun 2007 | 7 May 2008 | British | 67 years |
| Patrick Firth | Director | 15 Oct 2002 | 2 Apr 2003 | British | 71 years |
| Peter David Trippett | Director | 2 Apr 2003 | 29 Nov 2007 | British | 73 years |
| Peter Vincent Carolan | Director | 1 Jul 2019 | 15 Sept 2022 | Irish | 62 years |
| Robert Henry Armitage Chase | Director | 1 Jun 2006 | 20 Sept 2006 | British | 81 years |
| Roderick Antony Holdsworth | Director | 13 Oct 2004 | 6 May 2007 | British | 60 years |
| Roger Graham Sudbury | Director | 15 Oct 2002 | 2 Apr 2003 | British | 65 years |
| Scott Daniel Beard | Director | 1 Apr 2021 | 19 Dec 2022 | British | 45 years |
| Seamus Joseph Gillen | Director | 10 Sept 2002 | 15 Oct 2002 | British | 67 years |
| Sean David Kelly | Director | 5 Oct 2016 | 1 Apr 2021 | British | 59 years |
| Simon John Isherwood | Director | 2 Apr 2003 | 2 May 2008 | British | 68 years |
| Stephen Johnson | Director | 25 Sept 2006 | 15 Apr 2008 | British | 66 years |
| Trevor Matthew Hoyle | Director | 1 Jul 2018 | 27 Feb 2020 | British | 61 years |
| William James Cooper | Director | 23 Dec 2019 | 15 Sept 2022 | British | 53 years |
| William James Cooper | Secretary | 23 Dec 2019 | 15 Sept 2022 | - | - |