| Alan Blaylock | Director | 27 Apr 2001 | 22 May 2003 | British | 75 years |
| Andrew Christopher John Noble | Director | 9 Apr 2015 | 1 Mar 2017 | British | 65 years |
| Anthony Keith Hawkins | Director | 7 Sept 1992 | 30 Sept 2000 | British | 78 years |
| Christopher Peter John Gower | Secretary | 24 Feb 1997 | 23 Feb 1998 | British | - |
| Clifford Gerrard Moss | Director | 5 Sept 1997 | 22 May 2003 | British | 100 years |
| Daniel Keith Mazany | Director | 27 Apr 2001 | 30 May 2002 | American | 80 years |
| David Andrew Long | Secretary | 7 Sept 1992 | 10 Jun 1994 | British | - |
| David Arthur Mcalister | Director | 13 Jun 2000 | 12 May 2004 | American | 71 years |
| David Richard Vernon Luscombe | Director | 19 Jun 2002 | 22 May 2003 | British | 66 years |
| Douglas John Willis | Director | 30 May 2002 | 1 Nov 2002 | British | 75 years |
| Edward James Kolber | Director | 27 Apr 2001 | 22 May 2003 | British | 68 years |
| Gregory Richard Ayres | Director | 22 May 2003 | 28 May 2010 | British | 76 years |
| Iain Fairley Douglas | Director | 7 Sept 1992 | 30 Sept 1992 | British | 96 years |
| Jack Thomas Hill | Director | 5 Sept 1997 | 8 Dec 1999 | British | 83 years |
| Jack Woods | Director | 5 Sept 1997 | 1 Nov 2000 | British | 78 years |
| James Robert Wiegner | Director | 10 Sept 1996 | 30 May 1997 | American | 77 years |
| James William Camier | Director | 30 May 2002 | 1 Nov 2002 | American | 83 years |
| Joel Herbert Bennett | Director | 30 Oct 1998 | 18 Jun 1999 | American | 90 years |
| John Alexander Kennedy | Director | 7 Sept 1992 | 31 Oct 1992 | British | 84 years |
| John Bernard Gaskell | Director | 7 Sept 1992 | 1 Jun 1996 | British | 80 years |
| John Bordelon | Director | 27 Apr 2001 | 31 Aug 2002 | Usa | 76 years |
| John Frederick Sobke | Director | 15 Dec 1999 | 31 Jan 2002 | American | 87 years |
| John Jefferson Goody | Director | 18 Feb 1994 | 29 Dec 1995 | British | 82 years |
| John Raymond Springate | Director | 1 Jun 1996 | 5 Jun 2000 | British | 78 years |
| John Sabine Allsop | Secretary | 11 Jun 1998 | 14 Sept 1999 | British | - |
| Karen Anne Sewell | Director | 31 Jul 2016 | 15 Dec 2016 | British | 51 years |
| Karen Anne Sewell | Secretary | 15 Dec 2016 | 6 Mar 2025 | - | - |
| Lars Ericson | Director | 27 Apr 2001 | 22 May 2003 | Swedish | 68 years |
| Malcolm Frederick Booth | Director | 7 Sept 1992 | 1 Nov 1994 | British | 91 years |
| Maldwyn Noel John | Director | 7 Sept 1992 | 22 Feb 1994 | British | 97 years |
| Mark Webster Gordon | Director | 1 Jun 1996 | 3 May 2002 | British | 64 years |
| Mark William Naysmith | Director | 9 Apr 2015 | 16 Dec 2024 | British | 60 years |
| Michael Patrick Rogerson | Director | 9 Apr 2015 | 14 Sept 2020 | British | 60 years |
| Michael Raymond Windle | Director | 7 Sept 1992 | 31 Jul 1996 | British | 82 years |
| Nicholas William John Flew | Director | 19 Jan 2010 | 4 Jun 2013 | British | 66 years |
| Nikolas William Weston | Secretary | 31 Oct 2013 | 31 Jan 2016 | - | - |
| Noel Joseph Duffy | Director | 19 Jun 2002 | 10 Mar 2003 | British | 79 years |
| Paul Cheesmond | Director | 18 Jun 1999 | 21 Mar 2000 | British | 76 years |
| Peter Muir Kydd | Director | 30 May 2002 | 22 May 2003 | British | 70 years |
| Philip Richard Martin | Director | 13 Oct 2003 | 20 Jan 2006 | British | 69 years |
| Piers Morris | Secretary | 22 Sept 1994 | 24 Feb 1997 | British | - |
| Richard James Proctor | Secretary | 7 Jan 2010 | 31 Oct 2013 | - | - |
| Richard James Proctor | Secretary | 7 Jan 2010 | 31 Oct 2013 | - | - |
| Robert Andrew Gray | Director | 5 Sept 1997 | 4 Apr 2002 | British | 81 years |
| Robert Michael Morris | Director | 22 May 2003 | 28 May 2010 | British | 67 years |
| Roger Charles Mills | Director | 30 Mar 1994 | 1 Jun 1996 | British | 76 years |
| Stanley John Embleton Davidson | Secretary | 14 Sept 1999 | 8 Jan 2010 | British | - |
| Stephen Christopher Reynolds | Director | 21 Mar 2000 | 28 May 2010 | British | 71 years |
| Stephen Derek Bingham | Director | 10 Jun 2010 | 31 Jul 2016 | British | 67 years |
| Stephen James Cresswell | Director | 14 Apr 1999 | 1 Dec 2000 | British | 61 years |
| Stephen John Reffitt | Director | 5 Oct 2011 | 4 Dec 2015 | British | 68 years |
| Susan Elizabeth Freedman | Secretary | 15 Aug 1997 | 11 Jun 1998 | British | - |
| Suzan Audras | Director | 21 Mar 2000 | 3 May 2000 | British | 80 years |
| Thomas O'neill | Director | 27 Apr 2001 | 22 May 2003 | American | 75 years |
| Timothy John Matthews | Director | 13 Oct 2003 | 14 May 2007 | British | 75 years |
| William Barlow | Director | 27 Apr 2001 | 31 Dec 2002 | British | 102 years |
| William Cracraft Keightley | Director | 18 Feb 1994 | 10 Sept 1996 | American | 73 years |
| William Montgomerie Ritchie | Director | 10 Sept 1996 | 8 Dec 1999 | British | 82 years |
| William Montgomerie Ritchie | Director | 30 May 2002 | 31 Dec 2006 | British | 82 years |
| Woodrow Wilson Hitchcock | Director | 30 Oct 1998 | 21 Mar 2000 | American | 82 years |