| Anke Groth | Director | 1 Jun 2016 | 30 May 2018 | German | 56 years |
| Anthony David Cocker | Director | 12 Jun 2013 | 31 Jul 2017 | British | 67 years |
| Arnold Johan Groot | Director | 28 Jun 2001 | 18 Jul 2002 | Dutch | 60 years |
| Brian Jefferson Tear | Director | 1 Jan 2010 | 12 Jun 2012 | British | 58 years |
| Christian Barr | Director | 16 Jul 2018 | 31 Jul 2023 | German | 55 years |
| Christopher John Salame | Director | 18 Jul 2002 | 4 Mar 2004 | British | 74 years |
| Christopher John Salame | Secretary | 18 Jul 2002 | 4 Mar 2004 | British | - |
| Colin Roland Stevens | Director | 30 Jun 1991 | 4 May 1999 | British | 79 years |
| Colin Roland Stevens | Secretary | 30 Jun 1991 | 4 May 1999 | British | - |
| David Charles Adrian Baumber | Director | 31 Dec 2016 | 31 Mar 2023 | British | 52 years |
| David Owen Beynon | Director | 8 Nov 2004 | 15 Jun 2011 | British | 68 years |
| Fiona Scott Stark | Director | 4 Mar 2004 | 10 Dec 2009 | British | 64 years |
| Fiona Scott Stark | Director | 20 Jun 2012 | 31 Dec 2016 | British | 64 years |
| Graham John Wood | Director | 18 Jul 2002 | 15 Oct 2008 | British | 75 years |
| Hans Gisbert Ulmke | Director | 2 Jul 2001 | 27 Jun 2005 | German | 70 years |
| John Robert Milner | Director | 30 Jun 1991 | 31 Mar 1998 | British | 72 years |
| Mary Delia Clarke | Director | 10 Sept 2009 | 18 Oct 2016 | Irish | 62 years |
| Michael David Lewis | Director | 26 Apr 2017 | 31 May 2023 | British | 59 years |
| Neil Duncan Gilchrist Smith | Director | 27 Jun 2005 | 10 Sept 2009 | British | 62 years |
| Nigel John May | Director | 1 Jan 2010 | 1 Dec 2011 | British | 67 years |
| Peter Martin Wilson | Director | 21 Nov 2000 | 28 Jun 2001 | British | 76 years |
| René Matthies | Director | 12 Jun 2013 | 31 May 2016 | German | 56 years |
| Richard John Brooks | Director | 25 Jul 2022 | 29 Feb 2024 | British | 46 years |
| Robin Michael Owen Howell | Director | 31 Mar 1998 | 27 Nov 2000 | British | 80 years |
| Roy Blandford Stevenson | Director | 4 May 1999 | 27 Nov 2000 | British | 81 years |
| Roy Blandford Stevenson | Secretary | 4 May 1999 | 27 Nov 2000 | British | - |
| Sara Lyn Vaughan | Director | 31 Dec 2016 | 26 Nov 2020 | British | 62 years |
| Simon Christopher Cosson | Director | 1 Jan 2010 | 12 Jun 2013 | British | 57 years |
| Stefan Walter Hloch | Director | 2 Jul 2001 | 1 Jan 2010 | German | 65 years |
| Stephen James Ashford | Director | 27 Nov 2000 | 18 Jul 2002 | British | 75 years |
| Stephen James Ashford | Secretary | 27 Nov 2000 | 18 Jul 2002 | British | - |