| Alison Clare Reed | Director | 10 Sept 1996 | 8 Sept 1999 | British | 69 years |
| Amanda Mellor | Director | 28 Jul 2009 | 1 Feb 2019 | British | 61 years |
| Anthony Guthrie | Secretary | 12 Apr 2016 | 3 May 2018 | - | - |
| Catrin Elisabeth Thornton | Director | 8 Sept 1999 | 23 Jul 2001 | British | 65 years |
| Christopher Littmoden | Director | 21 Jun 1992 | 25 Jan 1994 | British | 82 years |
| Christopher Michael Williams | Director | 10 Jul 2000 | 31 Dec 2005 | British | 70 years |
| Christopher Paul Templeman | Director | 25 Oct 2012 | 25 Feb 2022 | British | 62 years |
| David Norton Roberts | Director | 21 Jun 1992 | 8 Sept 1999 | British | 70 years |
| Desmond Louis Mildmay Taljaard | Director | 4 Jul 2003 | 12 Nov 2004 | British | 64 years |
| Geoffrey Court Dart | Director | 25 Jan 1994 | 10 Sept 1996 | British | 76 years |
| Graham John Oakley | Director | 15 Jun 2004 | 28 Jul 2009 | British | 69 years |
| Hazel Debra Jarvis | Secretary | 25 Feb 2014 | 12 Apr 2016 | British | - |
| Hazel Debra Jarvis | Secretary | 8 Mar 2000 | 22 Jun 2012 | British | - |
| Ian David Coull | Director | 21 Jun 1992 | 31 Dec 2002 | British | 75 years |
| John Anderson Lusher | Director | 21 Jun 1992 | 14 Apr 1993 | British | 92 years |
| John Matthew Birch | Director | 7 Mar 2008 | 25 Oct 2012 | British | 50 years |
| Julia Foo | Secretary | 14 Jun 2019 | 7 May 2021 | - | - |
| Nick James Folland | Director | 1 Feb 2019 | 2 Nov 2023 | British | 60 years |
| Nicola Joy Dulieu | Director | 23 Jul 2001 | 15 Jun 2004 | British | 62 years |
| Philip Kershaw | Secretary | 28 May 1996 | 8 Mar 2000 | British | - |
| Philip William Davies | Secretary | 22 Jun 2012 | 25 Feb 2014 | British | - |
| Richard Andrew Chadwick | Director | 8 Sept 1999 | 7 Mar 2008 | British | 74 years |
| Roger Aldridge | Director | 14 Apr 1993 | 10 Jul 2000 | British | 78 years |
| Simon Lee Webster | Director | 31 Dec 2002 | 4 Jul 2003 | British | 65 years |
| Timothy Fallowfield | Secretary | 3 May 2018 | 14 Jun 2019 | - | - |
| William Hamilton | Secretary | 21 Jun 1992 | 28 May 1996 | British | - |