| Agnes Lawrie Addie Shonaig Macpherson | Director | 15 May 1991 | 15 May 1993 | British | 68 years |
| Agnes Lawrie Addie Shonaig Macpherson | Secretary | 15 May 1991 | 15 May 1993 | British | - |
| Anthony Gregory Baines | Director | 21 Aug 2009 | 28 Sept 2017 | British | 66 years |
| Armin Burger | Director | 21 Aug 2009 | 23 Nov 2009 | German | 63 years |
| David Ferguson Calow | Director | 15 May 1991 | 23 Mar 1990 | British | 88 years |
| James Hutcheson | Director | 1 Jan 2016 | 1 Jan 2025 | British | 53 years |
| Jane Cooper | Secretary | 1 Feb 1989 | 1 May 2007 | British | - |
| Jurgen Kroll | Director | 1 Jan 2002 | 31 Dec 2006 | German | 75 years |
| Mandy Louise Stretton | Director | 31 Dec 2006 | 31 Dec 2015 | British | 63 years |
| Matthew Campbell Barnes | Director | 22 Feb 2010 | 15 Apr 2018 | British | 53 years |
| Niall Thomas Patrick O'connor | Director | 2 Apr 2020 | 1 Jan 2025 | Irish | 56 years |
| Norbert Podschlapp | Director | 1 Jan 2002 | 31 Dec 2006 | German | 66 years |
| Norbert Podschlapp | Director | 23 Nov 2009 | 22 Feb 2010 | German | 66 years |
| Oliver James King | Director | 1 Apr 2018 | 1 Jan 2025 | British | 48 years |
| Paul Michael Foley | Director | 12 Sept 2000 | 21 Aug 2009 | British | 68 years |
| Roman Heini | Director | 22 Feb 2010 | 31 Mar 2015 | German | 50 years |
| Sarah Diane Walters | Secretary | 1 May 2007 | 1 Jan 2009 | British | - |
| Trevor Marwood Coates | Director | 8 Mar 1990 | 12 Sept 2000 | British | 80 years |
| Ulrich Wolters | Director | 23 Mar 1990 | 15 May 1993 | German | 84 years |
| Ulrich Wolters | Director | 23 Mar 1990 | 31 Dec 2001 | German | 84 years |
