| Aidan Birkett | Director | 1 Jul 2015 | 14 Mar 2018 | British | 74 years |
| Alexander Arlow | Director | 1 Jun 1992 | 16 May 1993 | British | 98 years |
| Alistair Hugh Asher | Director | 31 Dec 2013 | 24 Mar 2014 | British | 71 years |
| Alistair Hugh Asher | Director | 12 Sept 2016 | 1 Sept 2017 | British | 71 years |
| Andrew John Milton Bester | Director | 9 Jul 2018 | 31 Oct 2020 | British,south African | 61 years |
| Anne Margaret Gunther | Director | 6 Sept 2011 | 30 May 2014 | British | 71 years |
| Anthony Jonathan Reizenstein | Director | 14 Sept 2004 | 7 Dec 2010 | British | 70 years |
| Antony Philip Dawson Lancaster | Director | 27 May 2004 | 13 Jun 2007 | British | 84 years |
| Barry Tootell | Director | 4 Apr 2008 | 10 May 2013 | British | 65 years |
| Bennett Lyle Edward Reid | Director | 8 Jun 2009 | 31 Dec 2013 | British | 72 years |
| Brian Dolby Jones | Director | 1 Jun 1992 | 30 Apr 1993 | British | 92 years |
| Brona Rose Mckeown | Secretary | 2 Dec 2013 | 6 Oct 2017 | - | - |
| Bryce Paul Glover | Director | 10 Jan 2003 | 30 May 2003 | British | 66 years |
| Charles Norman Bralver | Director | 23 Apr 2015 | 31 Aug 2018 | American | 74 years |
| Christiaan Franciscus Henricus Herman Vogelzang | Director | 1 Sept 2018 | 18 Jun 2019 | Dutch | 64 years |
| Christopher Brian Blanchett | Director | 22 May 1996 | 16 May 2003 | British | 80 years |
| Christopher David Davis | Director | 23 Jul 2019 | 31 Oct 2021 | British | 60 years |
| Christopher William Jones | Director | 1 Aug 2009 | 31 Aug 2011 | British | 73 years |
| Craig Neil Shannon | Director | 14 Sept 2004 | 20 Aug 2007 | British | 63 years |
| David Anderson | Director | 1 Jun 2005 | 31 Jul 2009 | British | 71 years |
| David James Jackson | Director | 5 Nov 1996 | 16 May 2003 | British | 79 years |
| David Martin Conway | Director | 2 Nov 1999 | 28 Mar 2001 | British | 68 years |
| David Skinner | Director | 14 Jul 1992 | 3 Nov 1996 | British | 95 years |
| David Stuart Hollas | Director | 10 Dec 1997 | 8 Nov 2002 | British | 85 years |
| David William John Bagley | Secretary | 6 Oct 2017 | 5 Apr 2020 | - | - |
| David Wyndham Davies | Director | 3 Jun 2003 | 12 Jun 2013 | British | 79 years |
| Dennis Holt | Director | 3 Feb 2014 | 14 Mar 2018 | British | 78 years |
| Dennis Marcus Landau | Director | 1 Jun 1992 | 1 Jun 1993 | British | 99 years |
| Dennis Trevor Hughes | Director | 1 Jun 1993 | 19 May 1996 | British | 84 years |
| Derek James Weir | Director | 25 Jul 2014 | 31 Jul 2023 | British | 60 years |
| Duncan Harvey Bowdler | Director | 8 Jul 2009 | 9 Oct 2013 | British | 68 years |
| Edward Sebastian Grigg | Director | 11 Jan 2021 | 1 Jan 2025 | British | 61 years |
| Euan Angus Sutherland | Director | 9 Aug 2013 | 31 Dec 2013 | British | 57 years |
| Fiona Jane Clutterbuck | Director | 17 Apr 2023 | 7 Mar 2025 | British | 68 years |
| George Lennox Fyfe | Director | 1 Jun 1992 | 7 Jun 2000 | British | 85 years |
| George Stephan Pater | Director | 15 Jan 2006 | 22 Aug 2008 | British | 75 years |
| Gerard Patrick Pennell | Director | 22 Aug 2008 | 3 Oct 2008 | British | 67 years |
| Glyn Michael Smith | Director | 10 Oct 2016 | 1 Jan 2025 | British | 74 years |
| Gordon Younger | Director | 1 Jun 1992 | 1 Mar 1994 | British | 81 years |
| Graham Harold Stow | Director | 4 Mar 2003 | 6 Jun 2009 | British | 82 years |
| Graham John Melmoth | Director | 1 Jun 1992 | 16 May 2003 | British | 88 years |
| Graham Roy Bennett | Director | 1 Jun 1992 | 6 Jun 2009 | British | 76 years |
| John Duncan Baines | Director | 1 Oct 2014 | 11 Oct 2016 | British | 64 years |
| John Piers Williamson | Director | 1 Jul 2005 | 8 Sept 2011 | British | 65 years |
| John Worth | Director | 11 Oct 2016 | 20 Sept 2017 | British | 63 years |
| Kathrine Jane Bancroft | Secretary | 9 Oct 2013 | 2 Dec 2013 | - | - |
| Kathryn Anne Smith | Director | 8 Nov 2001 | 6 Jun 2009 | British | 67 years |
| Keith William Darwin | Director | 7 Jun 2000 | 23 May 2004 | British | 82 years |
| Kenneth John Lewis | Director | 18 May 1993 | 12 Nov 2002 | British | 78 years |
| Laura Martine Carstensen | Director | 27 May 2014 | 31 Dec 2018 | British | 66 years |
| Leonard Adrian Wardle | Director | 2 Feb 2006 | 9 Oct 2013 | British | 82 years |
| Liam John Coleman | Director | 11 Jul 2016 | 20 Jul 2018 | British | 60 years |
| Louise Jeanette Britnell | Director | 1 Mar 2021 | 31 Mar 2025 | British | 47 years |
| Martin Dudley Beaumont | Director | 22 May 1996 | 31 Jul 2007 | British | 77 years |
| Martyn James Wates | Director | 13 Nov 2007 | 5 Jun 2013 | British | 60 years |
| Maureen Laurie | Director | 30 Jun 2014 | 1 Sept 2017 | British | 73 years |
| Merlyn Vivienne Lowther | Director | 7 Sept 2011 | 30 May 2014 | British | 72 years |
| Mervyn Kay Pedelty | Director | 8 Sept 1997 | 15 Dec 2004 | British | 77 years |
| Michael Anthony Firth | Director | 1 Jun 1992 | 12 Dec 2002 | British | 80 years |
| Michael John Woodward | Director | 8 Dec 1992 | 1 Feb 2002 | British | 79 years |
| Moira Ann Lees | Secretary | 4 Apr 1996 | 9 Oct 2013 | British | - |
| Morteza Mahjour | Director | 12 Dec 2019 | 31 Dec 2020 | Canadian | 65 years |
| Neville Brian Richardson | Director | 1 Aug 2009 | 22 Jul 2011 | British | 69 years |
| Niall Booker | Director | 11 Jun 2013 | 31 Dec 2016 | British | 68 years |
| Nicholas Stuart Slape | Director | 9 Dec 2019 | 13 Feb 2025 | British | 63 years |
| Paul David Copley | Director | 1 Sept 2018 | 31 Dec 2019 | British | 51 years |
| Paul John Flowers | Director | 8 Jun 2009 | 5 Jun 2013 | British | 76 years |
| Paul William Hewitt | Director | 16 May 2003 | 21 Sept 2012 | British | 70 years |
| Peter John Harvey | Director | 1 Aug 2009 | 9 Oct 2013 | English | 71 years |
| Peter John Sutcliffe | Director | 10 Jan 2003 | 14 Jan 2006 | British | 79 years |
| Peter Vincent Marks | Director | 9 Jun 2009 | 16 May 2013 | British | 77 years |
| Phillip Andrew Lee | Director | 1 Aug 2009 | 16 Jun 2011 | British | 71 years |
| Ranjit Singh | Director | 12 Sept 2022 | 1 Jan 2025 | American | 64 years |
| Richard Coates | Director | 16 Jan 2013 | 26 Oct 2016 | British | 75 years |
| Richard Graeme Barclay Hardie | Director | 1 May 2013 | 21 Jun 2016 | British | 65 years |
| Richard James Slimmon | Director | 11 Jan 2021 | 1 Jan 2025 | British | 61 years |
| Richard Kevin Parkhouse | Director | 22 Aug 2008 | 31 Jul 2009 | British | 71 years |
| Richard Pym | Director | 11 Jun 2013 | 1 Oct 2014 | British | 77 years |
| Richard Thomas Goddard | Director | 8 Nov 2002 | 14 Jan 2006 | British | 69 years |
| Robert Graham Dench | Director | 1 Feb 2018 | 1 Jan 2025 | British | 76 years |
| Robert Henry Burlton | Director | 15 Jun 1993 | 1 Jun 1993 | British | 78 years |
| Robert Henry Burlton | Director | 1 Jun 1994 | 8 Nov 2001 | British | 78 years |
| Robert Henry Burlton | Director | 30 Mar 2004 | 15 Apr 2010 | British | 78 years |
| Robert Newton | Director | 1 Aug 2007 | 9 Oct 2013 | British | 76 years |
| Rodney Jensen Bulmer | Director | 1 Aug 2009 | 16 Jun 2011 | British | 56 years |
| Rodney Jensen Bulmer | Director | 18 May 2013 | 28 Feb 2014 | British | 56 years |
| Rodney Pennington Baker-bates | Director | 1 Aug 2009 | 31 Jul 2012 | British | 82 years |
| Roger John Gorvin | Director | 1 Jun 1992 | 5 Oct 1993 | British | 88 years |
| Roger Kenneth Jones | Secretary | 1 Jun 1992 | 4 Apr 1996 | British | - |
| Sally-ann Hibberd | Director | 1 Aug 2019 | 31 Jul 2022 | British | 67 years |
| Sheila Paula Barbara Macdonald | Director | 2 Nov 1999 | 14 Jan 2006 | British | 79 years |
| Simon John Butler | Director | 28 Jan 2003 | 6 Jun 2009 | British | 72 years |
| Stephen Gerald Watts | Director | 2 Feb 2006 | 8 Jul 2011 | British | 74 years |
| Stephen James Hughes | Director | 1 Jan 2025 | 2 Jun 2025 | British | 54 years |
| Stephen Michael Kingsley | Director | 1 Aug 2009 | 16 Jun 2011 | British,french | 74 years |
| Susan Elizabeth Harris | Director | 7 May 2019 | 1 Jan 2025 | British | 65 years |
| Terence James Thomas Of Macclesfield | Director | 1 Jun 1992 | 25 Oct 1997 | British | 89 years |
| Terence Morton | Director | 2 Feb 2006 | 6 Jun 2009 | British | 81 years |
| Thomas Francis Wood | Director | 1 Sept 2017 | 9 Oct 2018 | British | 54 years |
| Timothy Alan Franklin | Director | 1 Aug 2009 | 16 Jun 2011 | British | 65 years |
| Tom Agar | Director | 1 Jun 1992 | 19 May 1996 | British | 95 years |
| William Alan Prescott | Director | 1 Jun 1992 | 19 Apr 2000 | British | 83 years |
| William Gennydd Thomas | Director | 28 Oct 2013 | 27 Oct 2023 | British | 67 years |
| William John Marper | Director | 1 Jun 1992 | 14 Jan 2006 | British | 80 years |
| William Tucker | Director | 10 Dec 1997 | 4 Dec 2002 | British | 81 years |