| Anthony John Bernard Crean | Director | 17 Jul 1991 | 31 May 1995 | British | 91 years |
| Antony Dennis Barrett | Director | 17 Jul 1991 | 9 May 1994 | British | 93 years |
| Bastiaan Belder | Director | 30 May 2007 | 7 Nov 2007 | Dutch | 65 years |
| Bastiaan Belder | Secretary | 30 May 2007 | 7 Nov 2007 | Dutch | - |
| Bernadette Allinson | Secretary | 5 Oct 2007 | 15 Jun 2015 | Other | - |
| Catherine Mary Goates | Secretary | 17 Jan 2000 | 14 Aug 2000 | British | - |
| Catherine Mary Goates | Secretary | 1 Jan 2001 | 16 Dec 2002 | British | - |
| Colin Greenough Smith | Secretary | 17 Jul 1991 | 31 Aug 1996 | British | - |
| David Jack Leonard | Director | 8 Dec 2004 | 31 Aug 2006 | British | 65 years |
| David Jack Leonard | Secretary | 8 Dec 2004 | 31 Aug 2006 | British | - |
| Derek Munt | Director | 17 Jul 1991 | 31 Jul 1995 | British | 91 years |
| Derek Shaw | Director | 30 Jun 2006 | 23 Apr 2007 | British | 70 years |
| Ewen William Cameron | Secretary | 12 Oct 1999 | 17 Jan 2000 | British | - |
| Ewen William Cameron | Secretary | 14 Aug 2000 | 1 Jan 2001 | British | - |
| Flemming Dalgaard | Director | 16 Apr 2008 | 17 Jan 2014 | Danish | 61 years |
| Ganesh Raj Jayaraman | Director | 17 Jan 2014 | 16 Apr 2018 | Australian | 61 years |
| Graham Neil Dilley | Director | 30 May 2007 | 7 Nov 2007 | British | 74 years |
| James Hendry Paton | Director | 17 Jul 1991 | 3 Jul 1996 | British | 89 years |
| John Bradshaw | Director | 2 Nov 1998 | 16 Dec 2002 | British | 73 years |
| John Howard Kearsley | Director | 31 Jul 1995 | 16 Dec 2002 | British | 77 years |
| John Mark Woollacott | Director | 23 Apr 2007 | 30 May 2007 | Australian | 54 years |
| John Mark Woollacott | Director | 7 Nov 2007 | 11 May 2010 | Australian | 54 years |
| Mantraraj Dipak Budhdev | Director | 25 Jun 2019 | 25 Nov 2021 | British | 39 years |
| Mark Patrick Forrest | Director | 3 Jul 1996 | 2 Nov 1998 | British | 74 years |
| Michael Ellis Moore | Director | 30 Jun 2006 | 30 May 2007 | American | 69 years |
| Mohammad Alhashimy | Secretary | 15 Jun 2015 | 20 Jul 2023 | - | - |
| Mohammad Ebrahim Ali Alhashimy | Director | 25 Jun 2019 | 20 Jul 2023 | British | 40 years |
| Nicholas Haydn Glyndwr Rees | Secretary | 31 Aug 2006 | 23 Apr 2007 | British | - |
| Patrick William Walters | Director | 23 Apr 2007 | 30 May 2007 | British | 59 years |
| Patrick William Walters | Director | 7 Nov 2007 | 16 Apr 2008 | British | 59 years |
| Paul Thomas Thomson | Secretary | 31 Aug 1996 | 12 Oct 1999 | British | - |
| Peter Arthur Walker | Director | 16 Dec 2002 | 30 May 2007 | British | 72 years |
| Peter Arthur Walker | Director | 7 Nov 2007 | 1 Nov 2013 | British | 72 years |
| Richard Michael Gradon | Director | 16 Dec 2002 | 30 Jun 2006 | British | 66 years |
| Sameer Dileep Damle | Secretary | 23 Apr 2007 | 30 May 2007 | British | - |
| Sandra Scott | Director | 10 May 2004 | 8 Dec 2004 | British | 60 years |
| Sandra Scott | Secretary | 16 Dec 2002 | 8 Dec 2004 | British | - |
| Sarmad Mehmood Qureshi | Director | 11 May 2010 | 25 Jun 2019 | British | 55 years |