| Aarti Singhal | Director | 3 Jul 2013 | 4 Sept 2015 | British | 49 years |
| Andrew John Swanson | Director | 11 Jan 1996 | 13 Oct 2000 | British | 76 years |
| Andrew John Swanson | Secretary | 11 Jan 1996 | 26 Nov 1996 | British | - |
| Andrew Stephen James Ramsay | Director | 13 Oct 2000 | 11 Feb 2011 | British | 65 years |
| Catherine Mary Springett | Director | 26 Nov 1996 | 13 Oct 2000 | British | 69 years |
| Geert Herman August Peeters | Director | 15 May 2012 | 14 May 2013 | Belgian | 63 years |
| Graham Hunter Hadley | Director | 31 Oct 1992 | 12 Jan 1996 | British | 82 years |
| Granville Thomas Bateman Camsey | Director | 31 Oct 1992 | 31 Dec 1995 | British | 90 years |
| Iain Malcolm Irvine | Secretary | 13 Oct 2000 | 6 Sept 2017 | British | - |
| James Colin Eden Webster | Director | 31 Oct 1992 | 15 Jan 1996 | British | 90 years |
| Jason Anthony Keene | Secretary | 13 Oct 1999 | 13 Oct 2000 | British | - |
| Mark David Williamson | Director | 6 Dec 2004 | 15 May 2012 | British | 69 years |
| Maxwell Glyn Herbert | Secretary | 31 Oct 1992 | 11 Jan 1996 | British | - |
| Michael John Cusack | Director | 31 Oct 1992 | 31 Dec 1994 | British | 85 years |
| Peter David Terry | Director | 31 Oct 1992 | 5 Oct 1995 | British | 87 years |
| Philip Gotsall Cox | Director | 13 Oct 2000 | 6 Dec 2004 | British | 75 years |
| Philip Henry Smith | Director | 31 Oct 1992 | 26 Nov 1996 | British | 80 years |
| Pierre Jean Bernard Guiollot | Director | 14 May 2013 | 31 Mar 2017 | French | 58 years |
| Stanley Brian Birkenhead | Director | 31 Oct 1992 | 26 Nov 1996 | British | 85 years |
| Susan Diane Morgan | Secretary | 26 Nov 1996 | 13 Oct 1999 | British | - |