| Alison Ann Hargreaves | Secretary | 9 Aug 1993 | 13 Aug 1999 | British | - |
| Anthony Michael Ashton | Director | 1 Jan 1998 | 28 Feb 2003 | British | 83 years |
| Camilla Asabe Verona Faith | Director | 2 Dec 2015 | 9 Feb 2020 | British | 66 years |
| Caroline Mary Tolhurst | Secretary | 13 Aug 1999 | 1 Jul 2008 | British | - |
| Chantal Antonia Henderson | Director | 17 Oct 2014 | 31 Dec 2019 | British | 51 years |
| Colin John Redman | Director | 1 Jan 1998 | 10 Apr 2000 | British | 80 years |
| Craig David Mcwilliam | Director | 28 Apr 2016 | 10 Jan 2020 | British | 54 years |
| Derek John Lewis | Secretary | 7 Jun 2018 | 31 Mar 2022 | - | - |
| Douglas Robert Jan De Broekert | Director | 1 Jan 1993 | 31 Dec 1998 | British | 87 years |
| Duriye Petrides | Director | 8 Jan 2014 | 16 Dec 2016 | Australian | 53 years |
| George Ian Macloy Cockburn | Director | 1 Apr 1993 | 31 Dec 1997 | British | 81 years |
| Ian Douglas Mair | Director | 3 Dec 2012 | 20 Jun 2014 | British | 53 years |
| Ian Michael Philip Staines | Director | 26 Jul 1991 | 31 Dec 1991 | British | 95 years |
| Jeremy Henry Moore Newsum | Director | 26 Jul 1991 | 10 Apr 2000 | British | 71 years |
| Joanna Banfield | Director | 26 May 2017 | 31 Dec 2019 | British | 54 years |
| Jonathan Edward Hok | Director | 26 Jul 1991 | 8 Oct 1992 | British | 89 years |
| Jonathan Osborne Hagger | Director | 1 Jan 1992 | 10 Apr 2000 | British | 77 years |
| Jorge Emanuel Mendonca | Director | 16 Jan 2020 | 30 Jun 2020 | British | 63 years |
| Katharine Emma Robinson | Director | 1 Jul 2008 | 1 Jul 2008 | British | 62 years |
| Katharine Emma Robinson | Secretary | 1 Jul 2008 | 7 Jun 2018 | British | - |
| Mark Robin Preston | Director | 30 Jun 2006 | 30 Jun 2008 | British | 58 years |
| Peter Sean Vernon | Director | 1 Jul 2008 | 31 Dec 2016 | British | 67 years |
| Raymond Charles Williams | Director | 10 Apr 2000 | 31 Mar 2009 | British | 73 years |
| Richard Simon Handley | Director | 10 Apr 2000 | 3 Apr 2008 | British | 72 years |
| Roger Frederick Crawford Blundell | Director | 3 Apr 2008 | 25 Nov 2022 | British | 64 years |
| Sharon Reher | Director | 12 Apr 2007 | 17 Mar 2010 | British | 66 years |
| Simon Geoffrey Harding-roots | Director | 28 Apr 2016 | 30 Jun 2020 | British | 58 years |
| Stephen Howard Rhodes Musgrave | Director | 31 Dec 1998 | 30 Jun 2006 | British | 73 years |
| Susan Wendy Davies | Director | 1 Jan 1998 | 28 Apr 2006 | British | 75 years |
| Sylvia Rosamund Arthur | Director | 17 Jul 2006 | 30 Nov 2015 | British | 70 years |
| Tanya Lightbody | Director | 4 Nov 2010 | 15 Jun 2011 | British | 55 years |
| Ulrike Schwarz-runer | Director | 1 Feb 2011 | 28 Apr 2016 | Austrian | 55 years |
| William Robert Holland | Secretary | 26 Jul 1991 | 9 Aug 1993 | British | - |