| Andrew Richard Bryce | Director | 19 Nov 1997 | 11 Aug 2003 | United Kingdom | 79 years |
| Christian Schreyer | Director | 5 Nov 2021 | 20 Sept 2022 | German | 58 years |
| Christopher Moyes | Director | 11 Aug 2003 | 8 Jul 2006 | British | 77 years |
| David Allen Brown | Director | 1 Apr 2011 | 5 Nov 2021 | British | 66 years |
| Douglas Allenby Smith | Director | 19 Nov 1997 | 6 Dec 2001 | British | 109 years |
| Elizabeth Joan Lever | Director | 23 Jul 1991 | 19 Nov 1997 | British | 97 years |
| Elodie Marie Francoise Brian | Director | 5 Jun 2019 | 27 Sept 2021 | French | 47 years |
| Geoffrey Michael Parsons | Director | 1 Aug 2001 | 5 Jan 2004 | British | 63 years |
| Gordon Alexander Boyd | Director | 28 Sept 2021 | 28 Mar 2022 | British | 66 years |
| Helen Ena Gwendoline Lever | Director | 23 Jul 1991 | 19 Nov 1997 | British | 66 years |
| Hugh Malone | Director | 19 Nov 1997 | 11 Aug 2003 | United Kingdom | 78 years |
| Hugh Malone | Secretary | 19 Nov 1997 | 11 Aug 2003 | United Kingdom | - |
| Ian Philip Butcher | Director | 11 Aug 2003 | 1 Jul 2007 | British | 75 years |
| Ian Philip Butcher | Secretary | 11 Aug 2003 | 30 Jun 2006 | British | - |
| Ivor Philip Lever | Director | 23 Jul 1991 | 19 Nov 1997 | British | 59 years |
| Keith Down | Director | 7 Mar 2011 | 6 Dec 2015 | British | 61 years |
| Keith Lawrence Ludeman | Director | 10 Jul 2006 | 2 Jul 2011 | British | 76 years |
| Mark Robert Ferriday | Director | 20 Sept 2022 | 30 Apr 2023 | British | 51 years |
| Martin Stanley Andrew Ballinger | Director | 11 Aug 2003 | 31 Dec 2004 | British | 83 years |
| Nicholas Swift | Director | 17 Jul 2007 | 7 Mar 2011 | British | 62 years |
| Patricia Rosemary Elizabeth Lever | Director | 23 Jul 1991 | 19 Nov 1997 | British | 68 years |
| Patricia Rosemary Elizabeth Lever | Secretary | 19 Jul 1993 | 17 Nov 1997 | British | - |
| Rodney Alexander Luxton | Director | 19 Nov 1997 | 31 Jul 2001 | United Kingdom | 87 years |
| Simon Patrick Butcher | Director | 14 Mar 2016 | 30 Nov 2018 | British | 59 years |