| Aasa Ulrica Susanne Fearn | Director | 1 Jun 2018 | 15 Jun 2021 | Swedish | 53 years |
| Alan Rudge | Director | 9 Aug 1992 | 31 Oct 1997 | British | 89 years |
| Anthony Armitage Greener | Director | 1 Oct 2000 | 19 Nov 2001 | British | 86 years |
| Anthony Everard Ashiantha Chanmugam | Director | 16 Dec 2008 | 31 Jul 2016 | British | 72 years |
| Anthony John Booth | Director | 9 Aug 1992 | 30 Jun 1994 | British | 87 years |
| Barry David Romeril | Director | 9 Aug 1992 | 30 Jun 1993 | British | 83 years |
| Bernardus Johannes Maria Verwaayen | Director | 1 Feb 2002 | 30 Jun 2008 | Dutch | 74 years |
| Bert Carl Roberts | Director | 14 Oct 1994 | 17 Mar 1998 | Usa | 84 years |
| Brigit Erica Bruel | Director | 1 Apr 1995 | 31 Mar 1998 | German | 89 years |
| Colin Marsh Marshall | Director | 1 Apr 1995 | 18 Jul 2001 | British | 93 years |
| Colin Raymond Green | Director | 19 Nov 2001 | 1 Apr 2002 | British | 77 years |
| Colin Raymond Green | Secretary | 1 Aug 1994 | 19 Nov 2001 | British | - |
| David Gerald Scholey | Director | 9 Aug 1992 | 14 Oct 1994 | Swiss | 91 years |
| Edward Neville Isdell | Director | 1 Jul 1998 | 19 Nov 2001 | Irish | 83 years |
| Eric Albert Ash | Director | 9 Aug 1992 | 30 Jun 1993 | British | 98 years |
| Ewen Alastair John Fergusson | Director | 24 May 1993 | 31 Mar 1999 | British | 94 years |
| Francis Christopher Buchan Bland | Director | 1 May 2001 | 19 Nov 2001 | British | 88 years |
| Geoffrey John Mulcahy | Director | 9 Aug 1992 | 30 Jun 1994 | British | 84 years |
| Gerald Hugh Taylor | Director | 4 Nov 1996 | 9 Nov 1997 | American | 85 years |
| Glyn Parry | Director | 30 Jun 2007 | 12 Dec 2018 | British | 59 years |
| Hanif Mohamed Lalani | Director | 7 Feb 2005 | 16 Dec 2008 | British | 64 years |
| Heather Gwendolyn Brierley | Secretary | 3 Sept 2005 | 13 Aug 2019 | British | - |
| Helen Alexander | Director | 1 Jun 1998 | 19 Nov 2001 | British | 69 years |
| Iain David Thomas Vallance | Director | 9 Aug 1992 | 1 May 2001 | British | 83 years |
| Ian Paul Livingston | Director | 1 Jul 2008 | 18 Apr 2011 | British | 62 years |
| Ian Paul Livingston | Director | 14 May 2002 | 7 Feb 2005 | British | 62 years |
| James Iain Walker Anderson | Director | 1 Nov 1995 | 30 Sept 2001 | British | 88 years |
| John Keith Oates | Director | 1 Jun 1994 | 31 Dec 2000 | English | 84 years |
| John Vincent Wroe | Director | 4 Feb 2005 | 27 Nov 2006 | British | 68 years |
| John Vincent Wroe | Director | 27 Nov 2006 | 30 Jun 2007 | British | 68 years |
| June Frances De Moller | Director | 1 Sept 1999 | 19 Nov 2001 | British | 79 years |
| Kathryn Alice Zielinski | Secretary | 13 Aug 2019 | 15 Nov 2022 | - | - |
| Keighly Mckenna Droy-whelan | Director | 4 Mar 2020 | 31 Mar 2021 | British | 53 years |
| Laurence William Stone | Director | 1 Apr 2002 | 27 Nov 2006 | British | 69 years |
| Linda Bruce-watt | Director | 29 Sept 2017 | 17 Oct 2017 | British | 60 years |
| Louis Ralph Hughes | Director | 1 Jan 2000 | 19 Nov 2001 | American | 77 years |
| Maarten Albert Van Den Bergh | Director | 1 Sept 2000 | 19 Nov 2001 | Dutch | 84 years |
| Malcolm Argent | Director | 9 Aug 1992 | 31 Dec 1998 | British | 91 years |
| Malcolm Argent | Secretary | 9 Aug 1992 | 31 Jul 1994 | British | - |
| Martin Sydney Smith | Director | 13 Jul 2021 | 3 Apr 2023 | British | 56 years |
| Michael Bett | Director | 9 Aug 1992 | 31 Jan 1996 | British | 91 years |
| Michael Leslie Hepher | Director | 9 Aug 1992 | 31 Dec 1995 | British | 82 years |
| Norman Beresford Tebbit | Director | 9 Aug 1992 | 2 Nov 1996 | British | 95 years |
| Patrick James Bradley | Director | 17 Oct 2017 | 31 Aug 2018 | British | 50 years |
| Paul Graham Bosonnet | Director | 9 Aug 1992 | 1 Jan 1996 | British | 94 years |
| Peter Leahy Bonfield | Director | 1 Jan 1996 | 31 Jan 2002 | British | 82 years |
| Philip John Weston | Director | 1 Oct 1998 | 19 Nov 2001 | British | 88 years |
| Philip Roy Hampton | Director | 1 Nov 2000 | 14 May 2002 | British | 73 years |
| Robert Paul Brace | Director | 1 Oct 1993 | 31 Dec 2000 | British | 76 years |
| Roger Michael Eyre | Director | 3 Apr 2023 | 14 Apr 2025 | British | 47 years |
| Sean Mountford Graham Williams | Director | 18 Apr 2011 | 29 Sept 2017 | British | 63 years |
| Stephen John Prior | Secretary | 19 Nov 2001 | 3 Sept 2005 | British | - |
| William Cockburn | Director | 1 Apr 1998 | 31 Mar 2001 | British | 83 years |
| Yve Monica Newbold | Director | 9 Aug 1992 | 30 Jun 1997 | British | 86 years |