| David Hough | Secretary | 5 May 1992 | 27 Apr 2003 | British | - |
| Haico Herman Antoine Gerard Wevers | Director | 1 Jan 2014 | 1 Jun 2015 | Dutch | 59 years |
| Johannes Matheus Louis Dieteren | Director | 11 Mar 2011 | 24 Nov 2014 | Dutch | 62 years |
| Neil Alan Haworth | Director | 7 Jan 2008 | 11 Mar 2011 | British | 67 years |
| Philip Godfrey Roland | Director | 18 Jul 1994 | 28 Dec 2008 | British | 79 years |
| Raymond Victor Richards | Director | 21 Apr 2008 | 1 Oct 2020 | British | 68 years |
| Raymond Victor Richards | Secretary | 21 Apr 2008 | 1 Oct 2020 | British | - |
| Stephen Ronald Wakerly | Director | 1 Dec 2004 | 1 Jun 2011 | British | 78 years |
| Timothy Paul Greenall | Director | 5 May 1992 | 21 Apr 2008 | British | 76 years |
| Timothy Paul Greenall | Secretary | 27 May 2003 | 21 Apr 2008 | British | - |
| Wouter Leendert Den Dikken | Director | 5 May 1992 | 18 Jul 1994 | Dutch | 88 years |