| Afshan Ahmed | Secretary | 20 Apr 1998 | 1 Feb 1999 | British | - |
| Alan Geoffrey Moore | Director | 26 May 1998 | 1 Feb 1999 | British | 77 years |
| Alexandre Jean Keisser | Director | 14 Aug 2013 | 1 Jul 2017 | French | 56 years |
| Andrew Hyland | Director | 24 May 2022 | 14 Nov 2022 | Australian | 50 years |
| Andrew John Swanson | Director | 1 Feb 1999 | 13 Oct 2000 | British | 76 years |
| Andrew John Swanson | Secretary | 1 Feb 1999 | 13 Oct 2000 | British | - |
| Andrew Stephen James Ramsay | Secretary | 8 Jan 1997 | 20 Apr 1998 | British | - |
| Andrew Stephen James Ramsay | Secretary | 13 Oct 2000 | 3 Feb 2011 | British | - |
| Anthony Patrick Concannon | Director | 15 Aug 2003 | 7 Aug 2013 | British | 63 years |
| Augustin Marie Luc Honorat | Director | 7 Dec 2018 | 24 May 2022 | French | 49 years |
| Brian Barker | Director | 13 Aug 2002 | 19 Dec 2013 | British | 80 years |
| Carly Wishart | Director | 8 Jun 2018 | 7 Dec 2018 | Australian | 50 years |
| Christopher John Heathcote | Director | 28 Jun 1996 | 10 Oct 1996 | British | 63 years |
| Corinne Wylaine Ong | Secretary | 1 Dec 2005 | 30 Jan 2015 | British | - |
| David John Walton | Director | 15 Aug 2003 | 22 Feb 2008 | British | 67 years |
| David Whipple Crane | Director | 13 Oct 2000 | 30 Nov 2003 | American | 67 years |
| Debasis Baksi | Director | 16 Aug 2012 | 19 Dec 2013 | Australian | 69 years |
| Edward Alun Roberts | Director | 3 Mar 1994 | 18 Sept 1995 | British | 81 years |
| Edward Metcalfe | Director | 14 Oct 1999 | 15 Aug 2003 | British | 79 years |
| Frederik Baerts | Director | 20 May 2025 | 7 Oct 2025 | Belarusian | 45 years |
| Graham Austin Brown | Director | 15 Dec 1999 | 13 Oct 2000 | British | 70 years |
| Hendrik De Buyserie | Director | 14 Nov 2022 | 31 Mar 2025 | Belgian | 56 years |
| Hideshi Sahara | Director | 18 Mar 2021 | 1 Dec 2023 | Japanese | 62 years |
| James Anthony Thomas | Director | 28 Jun 1996 | 8 Jan 1997 | Welsh | 73 years |
| John Alexander Gaca | Director | 30 Apr 1997 | 26 May 1998 | British | 78 years |
| Julie Atanasovska | Secretary | 17 Sept 2008 | 10 Nov 2009 | British | - |
| Kenneth John Howard | Director | 3 Mar 1994 | 13 Mar 1996 | British | 80 years |
| Kevin Hugh Taylor | Director | 11 Feb 2009 | 7 Aug 2012 | British | 58 years |
| Lawrence Kim | Director | 14 Nov 2022 | 20 Feb 2023 | Australian | 48 years |
| Manouchehr Raznahan | Director | 14 Oct 1999 | 15 Dec 1999 | British | 81 years |
| Masao Omura | Director | 19 Dec 2013 | 31 Dec 2020 | Japanese | 67 years |
| Matthew Scott Donaldson | Director | 1 Jul 2017 | 14 Feb 2018 | Australian | 50 years |
| Maxwell Glyn Herbert | Director | 1 Feb 1999 | 14 Oct 1999 | British | 80 years |
| Michel Jean Gilbert Gantois | Director | 14 Feb 2018 | 8 Jun 2018 | Belgian | 59 years |
| Paul Francis Maguire | Director | 22 Feb 2008 | 5 May 2011 | Australian | 61 years |
| Philip Gotsall Cox | Director | 13 Oct 2000 | 15 Sept 2004 | British | 75 years |
| Philip Gotsall Cox | Director | 6 Jan 2005 | 16 Dec 2005 | British | 75 years |
| Philippe Langlet | Director | 25 Oct 2011 | 19 Dec 2013 | French | 66 years |
| Richard Gregory Curtis | Director | 13 Mar 1996 | 28 Jun 1996 | British | 64 years |
| Robert John Rollinson | Director | 1 Feb 1999 | 6 Oct 1999 | Australian | 79 years |
| Roderick James Jackson | Director | 8 Jan 1997 | 30 Apr 1997 | British | 86 years |
| Roger Derek Simpson | Secretary | 12 Aug 2011 | 31 May 2017 | - | - |
| Sarah Jane Gregory | Secretary | 1 Jun 2017 | 23 Jul 2021 | - | - |
| Stephanie Jane Newton | Secretary | 3 Mar 1994 | 8 Jan 1997 | British | - |
| Stephen Charles Orr | Director | 11 Feb 2009 | 19 Dec 2013 | Australian | 74 years |
| Stephen Riley | Director | 27 Mar 2000 | 15 Aug 2003 | British | 65 years |
| Stuart Nigel Jones | Director | 10 Oct 1996 | 8 Jan 1997 | British | 72 years |
| Thomas Elfed Rees | Director | 18 Sept 1995 | 8 May 1996 | Welsh | 89 years |
| Vincent Richard Harris | Director | 8 Jan 1997 | 31 Mar 1998 | British | 75 years |
| Wayne Gregory Kevern | Secretary | 27 Nov 2007 | 15 Nov 2019 | Australian | - |