| Christian Schreyer | Director | 5 Nov 2021 | 13 Oct 2022 | German | 58 years |
| Claire Madeleine Macgregor | Director | 1 Jan 1996 | 2 Mar 2012 | British | 66 years |
| Claire Madeleine Macgregor | Secretary | 14 Nov 2007 | 2 Mar 2012 | British | - |
| David Allen Brown | Director | 2 Mar 2012 | 5 Nov 2021 | British | 66 years |
| David Hector Golding | Director | 24 Jul 2017 | 4 Sept 2020 | British | 61 years |
| Donald Robinson Macgregor | Director | 7 Feb 1992 | 2 Mar 2012 | British | 96 years |
| Elodie Marie Francoise Brian | Director | 5 Jun 2019 | 27 Sept 2021 | French | 47 years |
| Gavin Craig Hunter | Director | 3 Nov 2014 | 31 Dec 2016 | British | 47 years |
| Gavin Scott Smith | Director | 18 Jul 2022 | 14 Jun 2024 | British | 46 years |
| George William Mutch | Director | 5 Nov 2012 | 5 Nov 2013 | British | 73 years |
| Gordon Alexander Boyd | Director | 28 Sept 2021 | 28 Mar 2022 | British | 66 years |
| Jeremy Hugh Cooper | Director | 24 Jul 2017 | 27 May 2022 | British | 59 years |
| Julian Mark Patterson | Director | 1 Nov 2013 | 14 Nov 2014 | British | 53 years |
| Keith Down | Director | 2 Mar 2012 | 6 Dec 2015 | British | 61 years |
| Malcolm David Macgregor | Director | 7 Feb 1992 | 9 Jun 1993 | British | 66 years |
| Malcolm David Macgregor | Secretary | 7 Feb 1992 | 9 Jun 1993 | British | - |
| Martin Richard Dean | Director | 3 Feb 2012 | 3 Feb 2012 | British | 63 years |
| Martin Richard Dean | Director | 2 Mar 2012 | 26 Apr 2019 | British | 63 years |
| Mary Mackenzie Macgregor | Director | 7 Feb 1992 | 31 Dec 1995 | British | 96 years |
| Robert James Macgregor | Director | 7 Feb 1992 | 13 Dec 2012 | British | 68 years |
| Sarah Jane Moser | Director | 7 Feb 1992 | 27 Nov 2007 | British | 63 years |
| Sarah Jane Moser | Secretary | 9 Jun 1993 | 14 Nov 2007 | British | - |
| Shaun David Tooth | Director | 4 Feb 2019 | 1 Oct 2025 | British | 53 years |
| Simon Patrick Butcher | Director | 14 Mar 2016 | 30 Nov 2018 | British | 59 years |
| Tamara Clair Harris | Director | 4 Dec 2013 | 31 Jul 2015 | British | 50 years |