| Adria Nadya Wochok Harris | Director | 1 Oct 2018 | 11 Jul 2021 | American | 50 years |
| Adrian Maccann | Director | 21 Sept 2004 | 23 Mar 2007 | Irish | 57 years |
| Andreas Brabeck Letmathe | Director | 15 Jan 2004 | 31 Aug 2012 | Austrian | 60 years |
| Barendina Willemina Hol | Director | 10 Sept 2012 | 15 Jun 2015 | Dutch | 52 years |
| Bruce David Newns | Director | 24 Mar 2007 | 1 Apr 2018 | British | 72 years |
| Catherine Sarah Pawan | Secretary | 20 Jan 2021 | 26 Nov 2024 | - | - |
| Christiane Schumacher | Director | 1 Sept 2015 | 31 May 2018 | German | 49 years |
| Christopher Ian Bennett | Director | 9 Apr 1998 | 15 Feb 2008 | British | 75 years |
| David Charles O'dell | Director | 15 Oct 1999 | 3 Jun 2004 | British | 70 years |
| David Emmett | Director | 12 Aug 1991 | 29 Feb 1996 | British | 68 years |
| David Griffiths | Director | 12 Aug 1991 | 23 Sept 1994 | British | 78 years |
| David James Jackson | Director | 23 Sept 1994 | 29 Nov 2001 | British | 78 years |
| Derek John Bailey | Director | 12 Aug 1991 | 15 Jan 2004 | British | 93 years |
| Derek Pritchard | Director | 24 Feb 1994 | 24 Oct 1997 | British | 80 years |
| Douglas John Ross | Director | 14 Jun 2017 | 1 Nov 2020 | British | 66 years |
| Eileen Olga Doyle | Director | 25 Sept 2008 | 1 Apr 2018 | British | 70 years |
| Fiona Braidwood | Director | 16 Nov 2000 | 20 Sept 2004 | British | 64 years |
| Geoffrey James Phillip Brown | Director | 12 Aug 1991 | 15 Oct 1999 | British | 71 years |
| George Wilfred Booth | Director | 12 Aug 1991 | 24 Jun 1993 | British | 110 years |
| Graham Martin Richard Davison | Director | 24 Oct 1997 | 4 Mar 1999 | British | 81 years |
| Ian Louis Natoff | Director | 12 Aug 1991 | 28 Oct 1993 | British | 92 years |
| Jessica Purchase | Director | 1 Jan 2021 | 22 Mar 2023 | British | 34 years |
| Jill Vanessa Jones | Director | 19 Feb 1992 | 23 Sept 1994 | British | 71 years |
| Jill Vanessa Jones | Secretary | 12 Aug 1991 | 23 Sept 1994 | British | - |
| John Bennie | Director | 25 Jul 1995 | 16 Nov 2000 | British | 82 years |
| John Nevill Hornibrook | Director | 12 Aug 1991 | 23 Sept 1994 | British | 97 years |
| Jonathan Brian Chick | Director | 1 Apr 2018 | 28 Sept 2022 | British | 60 years |
| Kate Elaine Hoile | Director | 29 Nov 2001 | 13 Jul 2017 | British | 61 years |
| Kathryn Jose Parker | Director | 4 Mar 1999 | 15 Jan 2004 | British | 69 years |
| Kay Parker | Director | 24 Feb 1994 | 24 Oct 1997 | British | 69 years |
| Kezia Jayn Vitug | Director | 1 Aug 2019 | 30 Sept 2020 | American,filipino | 49 years |
| Lindsay Frances Watt | Director | 1 Apr 2018 | 30 Jun 2018 | British | 53 years |
| Mandy Elizabeth Robertson | Director | 1 Apr 2018 | 30 Sept 2020 | British | 61 years |
| Mark Lloyd Williams | Director | 21 Sept 2004 | 25 Sept 2008 | Uk | 54 years |
| Mark Lloyd Williams | Director | 10 Sept 2012 | 19 Aug 2014 | Uk | 54 years |
| Mervyn Maurimootoo | Director | 1 Apr 2019 | 22 Mar 2023 | British | 48 years |
| Michael Joseph Bizley | Director | 12 Aug 1991 | 24 Oct 1997 | British | 83 years |
| Michael Leonhard Hahn | Director | 19 Oct 2010 | 1 Apr 2018 | German | 62 years |
| Michael Lisi | Secretary | 17 Dec 2019 | 20 Jan 2021 | - | - |
| Nebel Crowhurst | Director | 11 Jul 2021 | 12 Apr 2022 | British | 44 years |
| Olufunke Abimbola | Secretary | 22 Jun 2015 | 1 Mar 2016 | - | - |
| Oren Reich | Secretary | 1 Mar 2016 | 17 Dec 2019 | - | - |
| Paul Anthony Newton-syms | Director | 12 Aug 1991 | 13 Feb 1992 | British | 81 years |
| Paul Arthur Hooper | Director | 23 Sept 1994 | 25 Jul 1995 | British | 73 years |
| Richard David Daniel | Director | 23 Sept 1994 | 24 Oct 1997 | British | 69 years |
| Richard David Daniel | Secretary | 23 Sept 1994 | 22 Jun 2015 | British | - |
| Robert Bell | Director | 12 Aug 1991 | 28 Oct 1993 | British | 94 years |
| Roelof Kistemaker | Director | 24 Sept 2008 | 25 Feb 2013 | Swiss | 62 years |
| Sarah Philippa Jane Ridout | Director | 24 Oct 1997 | 29 Nov 2001 | British | 63 years |
| Sarah Ridout | Director | 7 Jan 2002 | 10 Sept 2012 | British | 63 years |
| Sharon Jayne Baxter | Director | 1 Apr 2018 | 31 Mar 2022 | British | 60 years |
| Stewart Branch | Director | 24 Feb 1994 | 7 Jan 2002 | British | 80 years |
| Sylvia Aston | Director | 29 Nov 2001 | 14 Oct 2010 | British | 84 years |
| Thomas Smith Mcintyre | Director | 19 Feb 1992 | 12 Mar 1998 | British | 86 years |
| Timothy Edwin Kelly | Director | 1 Mar 2017 | 21 Mar 2019 | American | 53 years |
| Tobin Charles Schilke | Director | 4 Aug 2014 | 10 Jun 2016 | American | 51 years |
| William Boyd | Director | 29 Feb 1996 | 20 Sept 2004 | British | 79 years |