| Alan Henry Haywood | Director | 1 Nov 2014 | 1 Jan 2017 | British | 60 years |
| Bernard Henri Auguste Leyraud | Director | 28 Jun 1996 | 1 May 2001 | French | 82 years |
| David Alan Rider | Director | 6 Oct 2014 | 30 Nov 2020 | British | 62 years |
| David James Bucknall | Director | 1 Jan 2012 | 1 Nov 2014 | British | 58 years |
| David Norman Green | Director | 1 Dec 1993 | 28 Jun 1996 | British | 78 years |
| David Sinclair Mace | Director | N/A | 1 Jan 1993 | British | 89 years |
| Debasish Satya Sanyal | Director | 1 Aug 2007 | 1 Jan 2012 | British | 61 years |
| Diane June Penfold | Secretary | N/A | 31 Jul 1993 | British | - |
| Dick Van Den Broek | Director | N/A | 28 Jun 1996 | Dutch | 88 years |
| Dipa Raivadera | Secretary | 7 Apr 1995 | 26 Nov 1997 | British | - |
| Douglas Patrick Chapman | Director | 19 Aug 1996 | 31 Jul 2007 | British | 76 years |
| Francis William Michael Starkie | Director | 19 Aug 1996 | 11 Sept 2009 | British | 77 years |
| Howard Charles Gatiss | Director | 28 Jun 1996 | 15 Sept 1997 | British | 68 years |
| John Christopher Withey | Director | 1 Feb 1993 | 19 Aug 1996 | British | 76 years |
| John Malcolm Travers Greensmith | Director | 1 Jan 1993 | 19 Aug 1996 | British,south African | 77 years |
| Katherine Anne Thomson | Director | 1 Jan 2017 | 18 Jun 2025 | British | 58 years |
| Kenneth Charles John Wraxall Hunter | Director | 1 Feb 1993 | 19 Aug 1996 | British | 75 years |
| Kenneth John Bullock | Director | 1 May 2003 | 20 Mar 2007 | British | 71 years |
| Melanie Anne Lee | Secretary | 18 Oct 1993 | 7 Apr 1995 | British | - |
| Per Andrew Reiff-musgrove | Director | 27 Sept 2011 | 31 Mar 2017 | British | 59 years |
| Peter Ankers | Director | N/A | 1 Dec 1993 | British | 81 years |
| Petrus Henricus Wilhelmus Marie Deverveldt | Director | 5 Aug 1998 | 14 Apr 1999 | Dutch | 68 years |
| Philip Thomas Edward Sanderson | Director | 31 Jan 2009 | 31 Mar 2021 | British | 57 years |
| Roger Alan Webber | Director | N/A | 31 Jan 1993 | British | 91 years |
| Roger Christopher Harrington | Director | 1 Oct 2009 | 6 Oct 2014 | British | 60 years |
| Roland Alexander Ilube | Director | 31 Mar 2021 | 12 Sept 2025 | British | 55 years |
| Sedick Kalam | Director | 20 Mar 2007 | 12 Apr 2011 | British | 74 years |
| Willem Hendrik August Grasso | Director | 28 Apr 1995 | 28 Jun 1996 | Dutch | 84 years |
| William Drummond Mathieson | Director | 20 Mar 2007 | 30 Jan 2009 | British | 70 years |
| Wulf Hinrich Bernotat | Director | N/A | 28 Apr 1995 | German | 78 years |
| Xavier Bertrand Marie Le Mintier | Director | 1 May 2001 | 20 Mar 2007 | French | 72 years |