| Andrew Mcintyre Smith | Director | 14 Jun 1992 | 14 Jun 1993 | British | 91 years |
| Andrew William Longden | Director | 6 Nov 2003 | 26 Jun 2015 | British | 69 years |
| Anthony Michael Walmsley | Director | 1 Jan 2000 | 31 Dec 2003 | British | 69 years |
| Antony Mcvicker Patterson | Director | 1 Jan 2008 | 31 Mar 2012 | British | 74 years |
| Arthur Lowthian | Director | 1 May 1998 | 31 Dec 2003 | British | 90 years |
| Barrie Hills | Director | 1 Jan 2008 | 1 Aug 2009 | British | 78 years |
| Bernhard Adrian Doeser | Director | 13 Jan 2004 | 30 Jun 2005 | British | 73 years |
| Brian Laurance Rowell | Director | 1 Oct 1993 | 8 Aug 1999 | British | 80 years |
| Cameron Andrew Mckeand Little | Director | 14 Jun 1992 | 30 Apr 1998 | British | 76 years |
| Charles Philip Harrison | Director | 5 Feb 2004 | 31 Aug 2006 | British | 77 years |
| Christopher Ernest Fay | Director | 1 Nov 1993 | 28 Feb 1999 | British | 81 years |
| Clive Russell Hopkins | Director | 1 Dec 2010 | 7 Mar 2019 | British | 79 years |
| David Brook Fortune | Director | 1 Jan 2010 | 31 Dec 2017 | British | 74 years |
| David Griffiths | Director | 14 Jun 1992 | 31 Dec 1995 | British | 79 years |
| David James Mansfield | Director | 1 Jan 2000 | 31 Dec 2007 | British | 74 years |
| David Mills Woolfenden | Director | 1 Jan 1995 | 31 Dec 1995 | British | 81 years |
| Duncan Manning | Director | 10 Oct 2013 | 10 Oct 2013 | British | 54 years |
| Edmund George Hunt | Director | 14 Jun 1992 | 14 Jun 1993 | British | 85 years |
| Edmund George Hunt | Director | 1 Jan 1994 | 31 Dec 1994 | British | 85 years |
| Edward David Daniels | Director | 1 Jan 2013 | 31 Mar 2014 | British | 60 years |
| Elizabeth Violetta Rayner | Director | 1 Jan 1996 | 31 Jan 2001 | British | 79 years |
| Ernest Van Mourik Broekman | Director | 14 Jun 1992 | 31 May 1995 | Dutch | 89 years |
| Evan Hill | Director | 1 Jan 1996 | 31 Aug 1998 | British | 80 years |
| Fiona Elizabeth Mccallum Mayhew | Director | 1 Jan 2012 | 31 Aug 2012 | British | 56 years |
| Frances Hinden | Director | 1 Jun 2018 | 31 Aug 2021 | British | 58 years |
| Fraser Adrian Johnson | Director | 1 Jan 2016 | 31 Dec 2023 | British | 53 years |
| George Prescott Silcock | Director | 1 Jan 2000 | 31 Dec 2003 | British | 84 years |
| Gillian Ruth Griffiths | Director | 13 Jan 2004 | 31 Dec 2005 | British | 78 years |
| Graham Bryant | Director | 1 Jan 2018 | 31 Dec 2021 | British | 73 years |
| Graham Michael Ferris | Director | 13 Jan 2004 | 31 Dec 2011 | British | 79 years |
| Graham Robert Van't Hoff | Director | 1 Jun 2012 | 31 Dec 2012 | British | 65 years |
| Graham Robert Vant Hoff | Director | 1 Aug 2004 | 31 Dec 2007 | British | 65 years |
| Harold Clive Mather | Director | 16 May 2008 | 31 May 2018 | British | 79 years |
| Harold Clive Mather | Director | 1 Feb 1993 | 31 Dec 1995 | British | 79 years |
| Harold Clive Mather | Director | 1 Mar 1999 | 31 Jul 2004 | British | 79 years |
| Hendrikus De Ruiter | Director | 14 Jun 1992 | 30 Jun 1994 | Dutch | 92 years |
| Hugh Sydney Mitchell | Director | 1 Mar 2005 | 31 May 2012 | British | 69 years |
| Ian Anthony Thornley | Director | 14 Jun 1992 | 31 Jan 1993 | British | 90 years |
| Ian Robert Anderson | Director | 1 Jan 2006 | 31 Dec 2009 | British | 81 years |
| Ian Ronald Gorst | Director | 13 Jan 2004 | 31 May 2010 | British | 76 years |
| James Andrew King | Director | 6 Oct 1998 | 31 Dec 2000 | British | 62 years |
| James Matheson Smith | Director | 11 Aug 2001 | 30 Apr 2011 | British | 75 years |
| James William Gordon | Director | 14 Jun 1992 | 30 Jun 1994 | British | 92 years |
| Jens Gobel | Director | 1 Sept 2012 | 31 May 2013 | German | 54 years |
| Jillian West | Director | 1 Jan 1996 | 31 Dec 1999 | British | 70 years |
| Jillian West | Director | 13 Jan 2004 | 8 Mar 2005 | British | 70 years |
| John Alexander Collins | Director | 14 Jun 1992 | 31 Oct 1993 | British | 85 years |
| John Anthony Greenhough | Director | 1 Jan 2006 | 31 Dec 2007 | British | 63 years |
| John Baker | Director | 1 Jan 1996 | 31 Dec 1999 | British | 89 years |
| John Connah | Director | 1 Jul 1994 | 8 Aug 1999 | Welsh | 67 years |
| John Daniel Hofmeister | Director | 1 Jan 1998 | 28 Feb 2005 | American | 78 years |
| John Duncan Inglis | Director | 1 Jan 1993 | 31 Dec 1995 | British | 91 years |
| John Heaton Stanning | Director | 14 Jul 2000 | 31 Dec 2003 | British | 78 years |
| John Leonard Booth | Director | 1 Apr 1994 | 31 Dec 2003 | British | 91 years |
| John Philip Maidment | Director | 14 Jun 1992 | 14 Jun 1993 | British | 95 years |
| Jonathan Adrian Kohn | Director | 1 Oct 2015 | 31 Jul 2021 | British | 57 years |
| Judith Stanley Quine | Director | 1 Jan 1996 | 30 Jun 2000 | British | 82 years |
| Keith Ashley Victor Mackrell | Director | 14 Jun 1992 | 31 Mar 1994 | British | 94 years |
| Keith James | Director | 1 Jan 2008 | 31 Jul 2011 | British | 69 years |
| Kenneth Charles Longhurst | Director | 14 Jun 1992 | 31 Dec 1995 | British | 82 years |
| Kenneth William Downham | Director | 14 Jun 1992 | 14 Jun 1993 | British | 90 years |
| Linda Jane Severn | Secretary | 29 Sept 2006 | 31 Mar 2016 | British | - |
| Maarten Albert Van Den Bergh | Director | 1 Jul 1994 | 30 Jun 2000 | Dutch | 84 years |
| Malcolm Arthur Brinded | Director | 1 Mar 1999 | 25 Mar 2002 | British | 73 years |
| Mary Anne Elizabeth Thompson | Secretary | 13 Feb 1996 | 1 Aug 2002 | British | - |
| Mary Clare Dewitt Corrie | Director | 1 Jan 2014 | 31 Dec 2021 | British | 66 years |
| Michael Harvey | Director | 14 Jun 1992 | 31 Dec 1997 | British | 92 years |
| Moira Elizabeth Shannon | Director | 1 Jan 2014 | 17 Oct 2017 | British | 65 years |
| Nathaniel Mead | Director | 1 Jan 2014 | 31 Dec 2015 | British | 50 years |
| Nicholas Donald Turner | Director | 1 Feb 2001 | 30 Sept 2006 | British | 76 years |
| Patricia Anne O'driscoll | Director | 2 Sept 2002 | 30 Jan 2004 | Irish | 67 years |
| Patrick Stephen Briggs | Director | 1 Jan 2010 | 31 Dec 2013 | British | 80 years |
| Paul Anthony Robinson | Director | 23 Sept 2010 | 31 Jul 2011 | British | 65 years |
| Paul David Milliken | Director | 1 Oct 2006 | 17 Feb 2014 | British | 72 years |
| Paul David Skinner | Director | 1 Jul 1994 | 28 Feb 1999 | British | 82 years |
| Peter David Seton Hadfield | Director | 1 Jun 1995 | 31 Jul 2001 | British | 87 years |
| Peter Michie Marshall | Secretary | 1 Aug 2002 | 29 Sept 2006 | British | - |
| Peter Ronald Mcdonald | Director | 1 Jan 2000 | 31 Dec 2003 | British | 80 years |
| Philip Richard Arner | Director | 14 Jun 1992 | 2 Jun 1997 | British | 72 years |
| Ralph Neil Gaskell | Director | 7 Jul 2000 | 6 Nov 2003 | British | 78 years |
| Raymond Gardner | Director | 6 Feb 2001 | 31 Dec 2001 | British | 79 years |
| Richard John Gates | Director | 14 Jun 1993 | 31 Dec 1993 | British | 86 years |
| Robert Lyle Craig | Director | 1 Jan 2012 | 31 Dec 2015 | British | 78 years |
| Robert Raymond Hutcheon Aitken | Director | 13 Feb 2002 | 31 Dec 2002 | British | 68 years |
| Robin Wilford Willsmore | Secretary | 14 Jun 1992 | 12 Feb 1996 | British | - |
| Rodney Gerard Brown | Director | 1 Jul 1998 | 31 Dec 2007 | British | 88 years |
| Rupert Michael Cox | Director | 1 Aug 2001 | 31 Dec 2001 | British | 82 years |
| Rupert Michael Cox | Director | 1 Aug 2001 | 30 Nov 2010 | British | 82 years |
| Russell Leslie O'brien | Director | 1 Jul 2015 | 31 Dec 2017 | British | 52 years |
| Ruth Hogendonk | Director | 1 Jan 1998 | 31 Dec 2003 | British | 87 years |
| Sheilagh Sworm | Director | 14 Jun 1993 | 31 Dec 1995 | British | 85 years |
| Sian Angharad Bowen | Director | 1 Jan 2012 | 31 Dec 2015 | Welsh | 51 years |
| Simon James Shimmin | Director | 13 Jan 2004 | 31 Dec 2005 | British | 77 years |
| Stephen Milner | Director | 1 Jan 2006 | 31 Dec 2007 | British | 67 years |
| Stephen Murley Garfield Hodge | Director | 14 Jun 1992 | 15 May 2008 | British | 84 years |
| Susan Elizabeth Garden | Director | 1 Jan 1996 | 30 Jun 1998 | British | 76 years |
| Susan Louise Jones | Director | 1 Jan 2016 | 31 Dec 2023 | British | 55 years |
| Thomas Christopher Foley | Director | 14 Jun 1993 | 1 Oct 1993 | British | 80 years |
| Thomas Michael Jarvis | Director | 1 Jan 1993 | 30 Jun 1994 | British | 87 years |
| Timothy Donald Ryan Morrison | Director | 1 Jul 2014 | 30 Sept 2024 | British | 73 years |
| Timothy William Faithfull | Director | 1 Jan 2004 | 21 May 2015 | British | 82 years |
| Trevor Haydn Walters | Director | 1 Jan 2006 | 30 Apr 2011 | British | 74 years |
| Trui Hebbelinck | Director | 18 Feb 2014 | 30 Sept 2015 | Belgian | 55 years |
| Victor Alexander Piotrowicz | Director | 1 Apr 2012 | 31 Dec 2013 | British | 71 years |
| Victor Michael Barkworth | Director | 14 Jun 1992 | 14 Jun 1993 | British | 81 years |
| Vincent Brian Keech | Director | 13 Jan 2004 | 31 Dec 2007 | British | 81 years |
| William Cran Thomson | Director | 14 Jun 1992 | 11 Aug 2001 | British | 100 years |