| Albert Wallace Cowie | Director | 1 Apr 2009 | 4 Sept 2021 | British | 91 years |
| Carolyn Holbrook | Director | 11 Nov 1997 | 28 Nov 2000 | British | 74 years |
| Chaitanya Vankayala | Secretary | 18 Nov 2019 | 22 Apr 2021 | - | - |
| Chantal Bray | Director | 15 Oct 2013 | 30 Nov 2018 | Canadian | 52 years |
| Clifford Dennis Porter | Director | 1 Jul 2004 | 28 Feb 2023 | British | 77 years |
| David Harvey Stenhouse | Director | 28 Nov 1992 | 31 Mar 1995 | British | 81 years |
| David Quest | Director | 25 Apr 2017 | 4 Oct 2018 | British | 49 years |
| David Richard Louis Duncan | Director | 28 Nov 1992 | 30 Jun 2004 | British | 91 years |
| David William Parish | Director | 28 Nov 1992 | 4 Aug 1998 | British | 81 years |
| Gary Kevin Simmons | Secretary | 1 Jan 1997 | 26 Feb 2001 | Bristish | - |
| Hannah Elizabeth Shepherd | Secretary | 27 Apr 2015 | 12 Sept 2016 | - | - |
| Ian Barrass | Director | 28 Nov 2000 | 27 Nov 2001 | British | 64 years |
| Ian Bruce Marshall | Secretary | 22 May 2001 | 24 May 2004 | British | - |
| Ian Thomas Leroni | Director | 6 Oct 2011 | 11 Jun 2014 | British | 67 years |
| Jane Fahey | Secretary | 12 Sept 2016 | 9 Nov 2017 | - | - |
| Jennafer Claire Te Brake | Secretary | 13 Apr 2018 | 18 Nov 2019 | - | - |
| Joanne Louise Holden | Director | 9 Apr 2019 | 19 Jul 2023 | British | 47 years |
| John Alfred Downes | Director | 28 Nov 1992 | 5 Apr 1995 | British | 108 years |
| John Stewart Liddle | Director | 2 Aug 1994 | 30 Jun 2004 | British | 82 years |
| Keith Anthony Robinson | Director | 1 Jan 1995 | 11 Mar 2003 | British | 70 years |
| Kenneth Thompson | Director | 28 Nov 1992 | 22 Feb 1995 | British | 93 years |
| Marc Rene George Dumbell | Director | 21 Oct 2014 | 7 Sept 2015 | British | 51 years |
| Margaret Anne Flavell | Director | 28 Nov 1992 | 11 Nov 1997 | British | 80 years |
| Mark Gregory Boyle | Director | 12 Oct 2015 | 25 Apr 2017 | British | 57 years |
| Matthew Nathan Gillen | Director | 4 Oct 2018 | 30 Sept 2025 | British | 42 years |
| Michael Geoffrey Hotchin | Director | 28 Nov 1992 | 30 Apr 2000 | British | 82 years |
| Michael Stephen Scragg | Director | 6 Oct 2011 | 13 Apr 2018 | British | 67 years |
| Patrick Albert George French | Director | 28 Nov 1992 | 30 Jun 2004 | British | 90 years |
| Patrick Albert George French | Secretary | 28 Nov 1992 | 31 Dec 1996 | British | - |
| Paul Frederick Doye | Director | 4 Aug 1998 | 22 May 2001 | British | 86 years |
| Paul Michael Antony Field | Director | 28 Nov 1992 | 3 Aug 1993 | British | 81 years |
| Peter Drummond Bowman | Director | 28 Nov 2000 | 1 Mar 2003 | British | 65 years |
| Peter John Reid | Director | 1 Jul 2004 | 28 Apr 2011 | British | 64 years |
| Richard John Woodhams | Director | 27 Nov 2001 | 7 Oct 2013 | British | 65 years |
| Richard William Quin | Secretary | 26 Feb 2001 | 22 May 2001 | Irish | - |
| Robert Hugh Musgrove | Secretary | 24 May 2004 | 12 Jun 2013 | British | - |
| Robert James Hinton | Secretary | 12 Jun 2013 | 20 Feb 2015 | - | - |
| Robert William Dix | Director | 25 May 1995 | 28 Aug 2003 | British | 74 years |
| Roger Granville Pilgrim | Director | 11 Nov 1997 | 8 Feb 2000 | British | 69 years |
| Sally Levete | Director | 28 Nov 1992 | 22 Dec 1996 | British | 90 years |
| Stephen Adams | Director | 11 Nov 1997 | 28 Nov 2000 | British | 69 years |
| Thomas Roland Plant | Director | 28 Nov 2000 | 1 Mar 2003 | British | 70 years |