| Alan Robert Robertson | Director | 1 Oct 2008 | 31 Dec 2023 | British | 64 years |
| Andries Johannes De Jong | Director | 10 May 2001 | 31 Dec 2008 | Dutch | 76 years |
| Charles Walton Richard Romney Coard | Director | 8 Jun 1992 | 25 Mar 1999 | British | 101 years |
| Derek Waller | Secretary | 1 Nov 2005 | 11 Jan 2010 | British | - |
| Frank Stevenson | Secretary | 19 Sept 1997 | 1 Nov 2005 | British | - |
| Hendrik Willem Renier August Maria Janssen | Director | 12 Dec 2016 | 1 Jul 2021 | Dutch | 72 years |
| Hendrik Willem Renier August Maria Janssen | Director | 3 Dec 2002 | 1 Sept 2016 | British | 72 years |
| Hendrikus Marinus Holterman | Director | 1 Sept 2016 | 12 Dec 2016 | Dutch | 71 years |
| Hugh David Wellesley Hoggard | Director | 8 Jun 1992 | 23 Mar 1995 | British | 103 years |
| Jan Kees De Pagter | Director | 5 Jan 2009 | 31 Dec 2009 | Dutch | 72 years |
| Mark Raymond Warrell | Secretary | 8 Jun 1992 | 19 Sept 1997 | British | - |
| Michael Smith | Director | 25 Mar 1999 | 19 Sept 2005 | British | 85 years |
| Naomi Anne Connell | Secretary | 11 Jan 2010 | 16 Jul 2023 | British | - |
| Naomi Anne Connell | Director | 26 Mar 2015 | 16 Jul 2023 | British | 61 years |
| Robert Damian Coupe | Director | 20 Feb 2017 | 11 Nov 2020 | British | 61 years |
| Stephen Jeffrey Cocliff | Director | 1 Sept 2016 | 31 Dec 2024 | British | 68 years |
| Thomas Lampe | Director | 1 Jul 2021 | 17 May 2023 | Dutch | 52 years |
| Wilhelmus Theodorus Johannes Dijkman | Director | 8 Jun 1992 | 10 May 2001 | Dutch | 85 years |
| Willem Hendrik Lanser | Director | 8 Jun 1992 | 24 May 1994 | Dutch | 84 years |