| Albert Jules Ghislain Marie Rolin | Director | 14 Aug 1991 | 31 Mar 2000 | Belgian | 92 years |
| Christophe Andre Bernard Chapron | Director | 19 Feb 2007 | 29 Feb 2016 | French | 62 years |
| David Courtenay Palmer-jones | Director | 1 Sept 2010 | 1 Jan 2020 | British | 63 years |
| David Eugene Murray | Director | 10 Oct 2000 | 31 Jul 2002 | British | 65 years |
| David Eugene Murray | Secretary | 16 Mar 2000 | 31 Jul 2002 | British | - |
| Elizabeth Jayne Clare Cooper | Secretary | 31 Jul 2002 | 31 Jul 2003 | British | - |
| Florent Thierry Antoine Duval | Director | 1 Feb 2016 | 31 Oct 2021 | French | 50 years |
| Francis Meyer | Director | 14 Aug 1991 | 31 Dec 1993 | French | 93 years |
| Frederick James Bryan | Director | 17 Mar 1998 | 31 Jul 2002 | British | 75 years |
| Graham Becket Jones | Director | 17 Mar 1998 | 16 Mar 2000 | British | 83 years |
| Graham Becket Jones | Secretary | 1 Jan 1992 | 31 Jul 2002 | British | - |
| Guido Lodewijk Weyns | Director | 16 Mar 1999 | 31 Mar 2000 | Belgian | 89 years |
| Ian Anthony Sexton | Director | 31 Jul 2002 | 19 Feb 2007 | British | 70 years |
| Ian Frederick Goodfellow | Director | 31 Jul 2002 | 31 May 2003 | British | 72 years |
| Jacques Andre Reymann | Director | 14 Aug 1991 | 31 Jul 2002 | Belgian | 89 years |
| Joan Knight | Secretary | 31 Jul 2003 | 6 May 2025 | British | - |
| Marek Robert Gordon | Director | 31 May 2003 | 31 Dec 2007 | British | 73 years |
| Peter Fergusson | Secretary | 14 Aug 1991 | 31 Dec 1991 | British | - |
| Philippe Casier | Director | 16 Feb 1998 | 31 Jul 2002 | Belgian | 82 years |
| Pierre Catlin | Director | 16 Feb 1998 | 8 Mar 2002 | French | 77 years |
| Robert James Wheatley | Director | 17 Mar 1998 | 31 May 2002 | British | 83 years |