| Alison Erica Macdonald | Director | 31 Aug 1994 | 31 May 2005 | British | 63 years |
| Alison Erica Macdonald | Secretary | 25 Jun 1996 | 31 May 2005 | British | - |
| Anthony John Burnet | Director | 13 Jul 1990 | 11 Mar 2006 | British | 80 years |
| David William Alexander Macdonald | Director | 14 Jul 1989 | 31 Aug 1994 | British | 92 years |
| Iain Lindsay Hamilton | Director | 3 Jul 1998 | 14 Aug 2009 | British | 71 years |
| Jean-marc Rene Boulan | Director | 30 Apr 2017 | 1 Jul 2022 | French | 54 years |
| Keith Lindsay Steel | Director | 14 Jul 1989 | 1 Apr 1996 | British | 82 years |
| Martha Jayne Fleming | Secretary | 1 Jun 2005 | 30 Apr 2017 | British | - |
| Martha Jayne Fleming | Director | 14 Aug 2009 | 30 Apr 2017 | British | 59 years |
| Neil Alexander Herdman Mckerrow | Director | 14 Jul 1989 | 29 Jun 1994 | British | 81 years |
| Peter Beszant Cullen | Director | 14 Jul 1989 | 31 Aug 1996 | British | 89 years |
| Peter Beszant Cullen | Secretary | 14 Jul 1989 | 25 Jun 1996 | British | - |
| Peter Jonathon Nelson | Director | 30 Apr 2017 | 1 Apr 2025 | British | 67 years |
| Peter Michael Arvor Darbyshire | Director | 7 Jun 1996 | 6 Jul 1998 | British | 76 years |