| Angus Harvey Taylor | Secretary | 26 Apr 1989 | 1 Sept 1989 | British | - |
| Anthony Jessup | Director | 26 Apr 1989 | 25 May 1990 | British | 98 years |
| Charles Bennett Brown | Secretary | 1 Mar 1999 | 26 May 2000 | British | - |
| Clare Pickering | Director | 1 Mar 2018 | 30 Apr 2025 | British | 56 years |
| Daphne Margaret Murray | Secretary | 29 Apr 2005 | 30 Jun 2018 | British | - |
| David Llewellyn | Director | 28 Jun 1996 | 24 Aug 1996 | British | 82 years |
| Emma Jayne Ashenden | Secretary | 25 Jan 2021 | 2 Feb 2023 | - | - |
| Frank James Standish | Secretary | 26 May 2000 | 1 Oct 2004 | British | - |
| Jason Alexander Smalley | Director | 31 Jul 2009 | 22 Oct 2016 | British | 57 years |
| Javier Francisco Suarez | Director | 21 Nov 2006 | 16 Jul 2008 | American | 56 years |
| John Anthony Robinson | Director | 1 Mar 1999 | 1 Apr 2004 | British | 78 years |
| Larry Jose Zea Betancourt | Director | 16 Jul 2008 | 1 Oct 2019 | Venezuelan | 65 years |
| Marco Antonio Moreno Estrada | Director | 12 Jun 2007 | 31 Jul 2009 | Mexican | 71 years |
| Mark Andrew Bevington | Director | 1 Apr 2004 | 8 Feb 2005 | British | 54 years |
| Michael David Hampson | Director | 30 Jun 2000 | 29 Jan 2001 | British | 68 years |
| Michael Leslie Collins | Director | 29 Jan 2001 | 23 Mar 2015 | British | 70 years |
| Narinder Nath Kalia | Director | 2 Sept 1996 | 1 Mar 1999 | British | 86 years |
| Narinder Nath Kalia | Secretary | 4 Sept 1989 | 1 Mar 1999 | British | - |
| Peter Hamilton Fulke Bullard | Director | 21 May 1990 | 28 Jun 1996 | British | 92 years |
| Peter Lance Young | Director | 26 Apr 1989 | 30 Jun 2000 | British | 88 years |
| Rebecca Juliet Wright | Secretary | 30 Jun 2018 | 25 Jan 2021 | - | - |
| Roy Leslie Flood | Director | 1 Mar 2005 | 9 Jan 2007 | English | 76 years |
| Tiffany Fern Brill | Secretary | 1 Oct 2004 | 29 Apr 2005 | British | - |
