| Allan Graham Gormly | Director | 3 May 1992 | 31 May 1997 | British | 89 years |
| Alvin Varner Shoemaker | Director | 3 May 1992 | 21 Apr 1994 | Us Citizen | 88 years |
| Andrew Kenneth Haste | Director | 2 Jun 2003 | 31 Dec 2011 | British | 64 years |
| Anthony David Arnold William Forbes | Director | 10 Aug 1994 | 31 May 1997 | British | 88 years |
| Anthony Piers Latham | Director | 28 Sept 2004 | 31 Dec 2007 | British | 76 years |
| Bernadette Clare Young | Secretary | 12 Nov 1999 | 17 Mar 2000 | British | - |
| Blathnaid Bergin | Director | 11 Aug 2014 | 25 Aug 2016 | Irish | 51 years |
| Charlotte Claire Jones | Director | 1 Jun 2021 | 1 Apr 2022 | British | 58 years |
| Charlotte Dawn Alethea Heiss | Director | 2 Mar 2016 | 1 Jun 2021 | British | 47 years |
| Christopher John Roland Rash | Director | 3 Sept 2013 | 23 Apr 2014 | British | 62 years |
| David Frank Barker | Director | 3 May 1992 | 19 Jul 1996 | British | 85 years |
| David John Morgan | Secretary | 3 May 1992 | 7 Aug 1996 | British | - |
| Denise Patricia Cockrem | Director | 3 Dec 2008 | 10 Oct 2012 | British | 64 years |
| Derek (john Derek) Alun-jones | Director | 3 May 1992 | 18 Apr 1996 | British | 93 years |
| Derek Martin Walsh | Director | 16 Jun 2011 | 29 Feb 2016 | British | 58 years |
| Edwin Nixon | Director | 3 May 1992 | 22 Apr 1993 | British | 101 years |
| Elinor Sarah Bell | Director | 16 Jun 2017 | 2 Nov 2017 | British | 57 years |
| Gavin Leslie Wilkinson | Director | 11 Dec 2014 | 2 Nov 2017 | British | 45 years |
| Ian Adam Craston | Director | 3 Dec 2008 | 1 Jun 2021 | British | 60 years |
| Ian David Hutchinson | Director | 2 Jun 2003 | 28 Sept 2004 | British | 72 years |
| Ian Lawton Rushton | Director | 3 May 1992 | 7 Sept 1993 | British | 95 years |
| Jacqueline Elizabeth Fox | Secretary | 11 Jul 2002 | 9 Dec 2005 | British | - |
| Jan Victor Miller | Director | 3 Mar 1998 | 28 Sept 2004 | British | 75 years |
| John Anthony Rowson | Director | 10 Aug 1994 | 31 May 1997 | British | 96 years |
| John Drummond Milne | Director | 3 May 1992 | 20 Apr 1995 | British | 102 years |
| John Graham Cuckney | Director | 3 May 1992 | 29 Apr 1994 | British | 101 years |
| John Hilton Berg | Secretary | 7 Aug 1996 | 12 Nov 1999 | British | - |
| John Michael Mills | Director | 2 Apr 2014 | 14 Nov 2014 | British | 62 years |
| John William Baker | Director | 3 Jan 1995 | 31 May 1997 | British | 89 years |
| Julian Christopher Hance | Director | 21 Dec 1998 | 2 Apr 2004 | British | 71 years |
| Mark George Culmer | Director | 19 May 2004 | 14 May 2012 | British | 64 years |
| Martin Hinton | Director | 2 Apr 2014 | 28 Jul 2015 | English | 61 years |
| Max Williams | Director | 3 May 1992 | 20 Apr 1995 | British | 100 years |
| Michael Harris | Director | 3 Dec 2008 | 31 May 2013 | British | 61 years |
| Michael John Dowdy | Director | 3 May 1992 | 31 May 1995 | British | 91 years |
| Nicholas Charles Faithorn Barber | Director | 3 May 1992 | 31 May 1997 | British | 86 years |
| Paul Lewis Miles | Director | 3 Dec 2008 | 30 Jun 2010 | British | 55 years |
| Paul Spencer | Director | 1 Jan 1996 | 30 Dec 1998 | British | 76 years |
| Richard Arthur Gamble | Director | 3 May 1992 | 31 Dec 1997 | British | 87 years |
| Rina Mukherjee | Secretary | 17 Mar 2000 | 31 Jul 2000 | British | - |
| Robert John Clayton | Director | 3 Dec 2008 | 25 Oct 2013 | British | 56 years |
| Robert Victor Mendelsohn | Director | 12 Nov 1999 | 11 Sept 2002 | United States | 80 years |
| Roy Alfred Elms | Director | 3 May 1992 | 19 Jul 1996 | British | 94 years |
| Rupert Edward Taylor Rea | Director | 2 Nov 2017 | 1 Jun 2021 | British | 48 years |
| Sydney Dennis Pennington | Director | 12 Nov 1999 | 2 Apr 2003 | British | 81 years |
| Thomas Arthur Hayes | Director | 12 Nov 1999 | 29 Jun 2001 | British | 83 years |
| Thomas Scott Nelson | Director | 26 Jun 1997 | 5 Mar 1998 | British | 87 years |
| Vanessa Jones | Secretary | 15 Sept 2000 | 26 Apr 2002 | British | - |
| William Edwin Buckley | Director | 3 May 1992 | 1 Feb 1994 | American | 89 years |
| William Robin Rowland | Director | 3 May 1992 | 19 Jul 1996 | British | 86 years |
| William Rufus Benjamin Mcdonnell | Director | 16 Jun 2011 | 3 Sept 2013 | British | 53 years |