| Andrew Christopher Bolter | Director | 3 Sept 2012 | 4 Apr 2014 | British | 56 years |
| Andrew Robert Simpson | Director | 10 Nov 2000 | 16 May 2005 | British | 72 years |
| Angela Claire Walker | Director | 3 Mar 2003 | 8 Sept 2004 | British | 64 years |
| Anthony Morgan | Director | 3 May 2000 | 16 May 2005 | British | 70 years |
| Charles Anthony Wentzel | Secretary | 31 Mar 1992 | 17 Jul 1992 | British | - |
| David Bruce Moore | Director | 17 Jul 1992 | 19 Apr 1999 | British | 75 years |
| David Connal Cather | Director | 1 Mar 1998 | 8 Sept 2004 | British | 67 years |
| David Thomas Johnson | Secretary | 17 Jul 1992 | 16 May 2005 | British | - |
| Derek Smith | Director | 17 Jul 1992 | 31 Mar 2001 | British | 75 years |
| Fiona Puleston Penhallurick | Director | 4 Apr 2014 | 15 Mar 2016 | British | 59 years |
| Francis Keith John Jackson | Director | 19 Apr 1999 | 8 Sept 2004 | British | 77 years |
| Graham Samuel Greenhalgh | Director | 2 May 2001 | 8 Sept 2004 | British | 79 years |
| Guy Franklin Young | Director | 1 Feb 2011 | 31 Oct 2015 | South African | 57 years |
| Ian Pughsley | Director | 24 Jan 1996 | 31 Dec 1997 | British | 72 years |
| James Ashton Lister | Director | 19 Sept 1991 | 31 Mar 1992 | British | 92 years |
| James Mcneilly Evans | Director | 3 May 2000 | 2 May 2001 | British | 85 years |
| James Richard Stirk | Secretary | 16 May 2005 | 30 Nov 2012 | British | - |
| Johannes Frederick Van Blerk Serfontein | Director | 1 Aug 2006 | 1 Feb 2011 | South African | 58 years |
| John Draper | Director | 31 Mar 1992 | 5 Jul 1999 | British | 85 years |
| John Ferguson Bowater | Director | 2 May 2001 | 3 Mar 2003 | British | 77 years |
| John Richard Bradshaw | Secretary | 30 Nov 2012 | 28 Jun 2013 | British | - |
| John Stuart Wilkinson | Director | 19 Sept 1991 | 12 Jul 1994 | British | 82 years |
| Kenneth Alfred Riley | Director | 17 May 1999 | 11 Mar 2002 | British | 85 years |
| Malcolm Warren Thompson | Director | 3 May 2000 | 12 May 2005 | British | 59 years |
| Michael Gerald Garland | Director | 30 May 2000 | 16 May 2005 | British | 69 years |
| Michael John Choules | Director | 12 Sept 2014 | 9 Apr 2021 | British | 66 years |
| Richard Ashton Lister | Director | 19 Sept 1991 | 31 Mar 1992 | British | 85 years |
| Richard Ashton Lister | Secretary | 19 Sept 1991 | 31 Mar 1992 | British | - |
| Richard John Wood | Director | 9 Apr 2021 | 30 Sept 2022 | British | 54 years |
| Robert Sinclair Robertson | Director | 22 Jul 1997 | 8 Sept 2004 | British | 75 years |
| Ruth Sarah Button | Director | 30 Sept 2022 | 1 Oct 2025 | British | 42 years |
| Terence Robert Last | Director | 16 May 2005 | 7 Jan 2013 | British | 76 years |
| Timothy Charles Jackson | Director | 16 May 2005 | 31 Jul 2006 | British | 74 years |
| Timothy Conrad Langston Hall | Director | 19 Sept 1991 | 16 May 2005 | English | 73 years |
| Warren Stuart Hall | Director | 3 May 2000 | 16 May 2005 | British | 76 years |
| William Potter | Director | 19 Sept 1991 | 30 Sept 1995 | British | 94 years |