| Adam Paul Rutherford | Secretary | 18 Sept 1998 | 15 Dec 1999 | British | - |
| Alexander Daniel Jeffrey | Director | 11 Sept 2012 | 23 Mar 2018 | British | 60 years |
| Alison Morris | Director | 1 Oct 2021 | 6 Sept 2024 | British | 67 years |
| Andrew Timothy Jenkinson | Director | 27 Apr 1992 | 10 Jun 1996 | British | 73 years |
| Anne Helen Richards | Director | 7 Jun 2016 | 10 Aug 2018 | British | 62 years |
| Anthony Christopher Gaughan | Director | 14 Mar 2008 | 14 Aug 2009 | British | 58 years |
| Anthony John Ashplant | Director | 22 Nov 1999 | 22 Jan 2001 | British | 72 years |
| Anthony John Ashplant | Director | 16 Nov 2001 | 23 Mar 2016 | British | 72 years |
| Chris Chaloner | Director | 1 Oct 2021 | 2 Sept 2025 | British | 68 years |
| Christopher Paul Edwards | Director | 10 May 1991 | 15 Jan 1993 | British | 85 years |
| Christopher Spencer Cheetham | Director | 10 May 1991 | 29 Mar 1996 | British | 71 years |
| David Edward Stuart | Director | 30 Jun 1998 | 30 Sept 1998 | British | 68 years |
| David Kenneth Watson | Director | 22 Nov 1999 | 29 Dec 2000 | British | 67 years |
| David William Hanson | Director | 10 May 1991 | 31 Dec 1995 | British | 81 years |
| Derek Alan Higgs | Director | 8 Mar 1996 | 15 May 2000 | British | 82 years |
| Edward Louis Rosengarten | Director | 1 Jan 2001 | 28 Oct 2010 | British | 58 years |
| Eric Robert Lewis Sandlund | Director | 3 Jun 1996 | 31 Aug 1999 | American | 69 years |
| Fiona Jane Molloy | Secretary | 12 Aug 2002 | 13 Jan 2006 | British | - |
| Gary Nicholas Cotton | Director | 29 Nov 2011 | 30 Sept 2019 | British | 57 years |
| Gillian Kathleen Wood | Secretary | 3 Dec 1996 | 18 Sept 1998 | British | - |
| Graham David Mason | Director | 28 Apr 2015 | 31 Dec 2021 | South African | 64 years |
| Grant Robert Fairlie Speirs | Director | 3 Nov 2008 | 31 Jan 2019 | British | 55 years |
| Hugh Royston Jenkins | Director | 10 May 1991 | 31 Dec 1995 | British | 93 years |
| Huw Martin Jones | Director | 10 May 1991 | 15 May 2000 | British | 78 years |
| Ian Watts Horton | Director | 3 Jun 1996 | 20 Feb 1998 | Australian | 79 years |
| John Clark Betteridge | Director | 1 May 1997 | 29 Dec 2000 | British | 68 years |
| John Coltman Heron Brumwell | Secretary | 10 May 1991 | 27 Apr 1995 | British | - |
| John William Foley | Director | 2 Oct 2006 | 31 Dec 2010 | British | 70 years |
| John William Foley | Director | 18 Jan 2019 | 1 Sept 2021 | British | 70 years |
| Jonathan Carl Leslie Willcocks | Director | 20 Feb 2020 | 1 Oct 2021 | British | 59 years |
| Jonathan Mark Brewis Daniels | Director | 20 Jan 2011 | 31 Dec 2017 | British | 63 years |
| Jonathan Mark Brewis Daniels | Director | 17 Oct 2019 | 4 Apr 2023 | British | 63 years |
| Jonathan Peter Mcclelland | Secretary | 15 Dec 1999 | 12 Aug 2002 | British | - |
| Jonathan Peter Mcclelland | Secretary | 11 Jan 2005 | 9 Mar 2005 | British | - |
| Jonathan Peter Mcclelland | Secretary | 26 Jul 2005 | 30 Jan 2006 | British | - |
| Jonathan Windsor Morgan | Director | 26 Jan 1995 | 15 May 2000 | British | 69 years |
| Julian Christopher Gell | Director | 10 May 1991 | 29 Dec 2000 | British | 75 years |
| Kerryn Lynn Macdonald | Secretary | 30 Apr 2004 | 9 Mar 2005 | British | - |
| Leslie John Scrine | Director | 13 May 2004 | 30 Apr 2012 | British | 68 years |
| Lorraine Ingrid Baldry | Director | N/A | 30 Jun 1998 | British | 77 years |
| Margaret Mary Ammon | Director | 20 Mar 2018 | 17 Oct 2019 | British | 59 years |
| Martin Lewis | Director | 22 Nov 1999 | 29 Dec 2000 | British | 70 years |
| Martin Lewis | Director | 16 Nov 2001 | 13 Jun 2016 | British | 70 years |
| Martin Richard Moore | Director | 1 May 1997 | 11 Dec 2000 | British | 70 years |
| Martin Richard Moore | Director | 2 Jan 2007 | 11 Sept 2012 | British | 70 years |
| Meagen Lyn Burnett | Director | 18 Feb 2020 | 1 Oct 2021 | Irish | 52 years |
| Michael George Alexander Mclintock | Director | 12 Nov 1999 | 6 Jun 2016 | British | 65 years |
| Michael George Newmarch | Director | 10 May 1991 | 23 Jan 1995 | British | 88 years |
| Michael John Denham | Director | 10 May 1991 | 15 May 2000 | British | 76 years |
| Michelle Sylvia Scrimgeour | Director | 13 Jun 2012 | 23 Feb 2017 | British | 63 years |
| Neil Michael Donnelly | Director | 9 Jun 2017 | 29 Oct 2019 | Irish | 54 years |
| Nicholas Charles William Mustoe | Director | 1 May 1997 | 31 Mar 2000 | British | 65 years |
| Nicholas Henry Croom Thompson | Director | 1 May 1997 | 11 Dec 2000 | British | 77 years |
| Patrick Norman Chaloner Johns | Director | 3 Jun 1996 | 31 Jan 2000 | British | 71 years |
| Paul Brooks | Director | 10 May 1991 | 26 Jan 1995 | British | 72 years |
| Peter John Davis | Director | 18 Dec 1995 | 22 Apr 1996 | British | 85 years |
| Philip Michael Johnson | Director | 16 Nov 2001 | 12 Sept 2008 | British | 55 years |
| Richard Mark Brewster | Director | 10 May 1991 | 13 Apr 1992 | British | 70 years |
| Robert Sidney Allen | Secretary | 1 Jan 1994 | 3 Dec 1996 | British | - |
| Rodney John Dennis | Director | 10 May 1991 | 1 Nov 1999 | British | 74 years |
| Rodney Pennington Baker-bates | Director | 14 Aug 1998 | 15 May 2000 | British | 82 years |
| Ronald Edward Savage | Director | 10 May 1991 | 19 Nov 1993 | British | 74 years |
| Russell William Swansen | Director | 3 Jun 1996 | 19 Nov 1999 | American | 69 years |
| Sai Hung Wong | Director | 9 Jun 1999 | 13 Feb 2001 | British | 71 years |
| Samuel John Morse | Director | 15 May 2000 | 15 Nov 2001 | British | 64 years |
| Sean Andrew Fitzgerald | Director | 9 Sept 2019 | 13 Jan 2025 | British | 61 years |
| Simon Humphrey Westland Pilcher | Director | 22 Nov 1999 | 1 Apr 2019 | British | 60 years |
| Stephen James Cook | Director | 3 Jun 1996 | 30 Jul 1999 | British | 75 years |
| Stephen John Rawnsley | Director | 17 Apr 1998 | 14 Jan 1999 | New Zealand | 71 years |
| Vivian Paul Bazalgette | Director | 6 Jul 2000 | 15 Nov 2001 | British | 75 years |