| Abhishek Wahi | Director | 26 Sept 2022 | 25 Sept 2024 | British | 44 years |
| Adele Ann Abigail | Director | 7 Aug 2008 | 1 Oct 2009 | Irish | 53 years |
| Alan Gray Rutherford | Director | 17 May 1995 | 1 Sept 1998 | British | 84 years |
| Alistair Charles Walter Williams | Director | 1 May 2002 | 18 Apr 2003 | British | 63 years |
| Andrew Douglas Gill | Director | 20 Sept 2022 | 16 Feb 2023 | British | 46 years |
| Andrew Mark Smith | Director | 29 Jun 2009 | 20 Jun 2012 | British | 62 years |
| Aniko Mahler | Director | 3 Jan 2023 | 2 Dec 2024 | Hungarian | 50 years |
| Anthony Armitage Greener | Director | 26 May 1989 | 11 May 1992 | British | 86 years |
| Anthony Armitage Greener | Director | 10 May 1996 | 1 Sept 1998 | British | 86 years |
| Anthony John Tennant | Director | 26 May 1989 | 19 Jul 1989 | British | 96 years |
| Brendon Richard O'neill | Director | 1 Jan 1992 | 30 Apr 1998 | British | 78 years |
| Brian Higgs | Director | 29 Nov 2011 | 5 Apr 2013 | British | 67 years |
| Bryan Harold Donaghey | Director | 26 May 2006 | 14 May 2013 | British | 65 years |
| Carlos Valle Diaz | Director | 1 Jan 2021 | 30 Jun 2022 | Mexican | 38 years |
| Charles Dawson Coase | Director | 7 Apr 2005 | 31 Mar 2011 | British | 66 years |
| Christopher Mark Davies | Director | 10 Aug 2007 | 31 Mar 2009 | British | 56 years |
| Christopher Richard Roff Marsh | Director | 26 May 2006 | 30 Sept 2007 | British | 58 years |
| Claire Elizabeth Matthews | Secretary | 2 Feb 2012 | 5 Jan 2018 | - | - |
| Crispen Henry Davis | Director | 23 Jul 1990 | 12 Oct 1993 | British | 77 years |
| David Allan Maclean Connell | Director | 26 May 1989 | 31 Jan 1992 | British | 96 years |
| David Anthony Hardie | Director | 1 Sept 1998 | 1 Dec 1999 | British | 82 years |
| David Frederick Harlock | Director | 26 May 2016 | 1 Aug 2018 | British | 66 years |
| David Heginbottom | Director | 16 Jun 2011 | 1 Oct 2014 | British | 56 years |
| David Mark Francis | Director | 16 Mar 2010 | 24 Oct 2012 | British | 53 years |
| David Scott | Director | 1 Sept 1998 | 31 Mar 1999 | American | 74 years |
| Dayalan Nayager | Director | 6 Apr 2017 | 31 Dec 2018 | South African | 45 years |
| Donald Niven Allen Mclure | Director | 26 May 1989 | 30 Sept 1989 | British | 100 years |
| Dora Keresztesi | Director | 26 Sept 2022 | 9 Nov 2022 | Hungarian | 40 years |
| Eduardo Peroni Barp | Director | 15 Jan 2019 | 8 Oct 2019 | Italian | 58 years |
| Ewan Andrew | Director | 27 Sept 2006 | 27 Sept 2006 | British | 51 years |
| Finn Johnsson | Director | 17 Mar 1995 | 28 Feb 1998 | Swedish | 80 years |
| Francis Ian Chapman | Director | 26 May 1989 | 31 Dec 1990 | British | 101 years |
| Gabor Zeisler | Director | 5 Nov 2015 | 1 Aug 2020 | Hungarian | 53 years |
| Gavin Paul Crickmore | Director | 10 Aug 2007 | 30 Jun 2020 | British | 68 years |
| Graham Kettle | Director | 19 Jul 1989 | 31 Dec 1991 | British | 78 years |
| Graham Lancaster Thompson | Director | 1 Jan 1992 | 12 Jun 1995 | British | 82 years |
| Hina Patel | Director | 28 Sept 2018 | 29 Mar 2022 | British | 47 years |
| Irina Shalaeva | Director | 12 Feb 2025 | 1 Nov 2025 | Russian | 46 years |
| Jill Kyne | Director | 18 Feb 2008 | 29 Jun 2009 | British | 62 years |
| John Brian Mcgrath | Director | 1 Sept 1998 | 18 Dec 2000 | British | 88 years |
| John Ivor Lewis | Director | 1 Jan 1992 | 1 Sept 1998 | British | 81 years |
| John James Nicholls | Director | 16 Jun 2011 | 9 Mar 2018 | British | 64 years |
| John James Nicholls | Secretary | 15 Mar 2002 | 2 Feb 2012 | British | - |
| John Michael Joseph Keenan | Director | 1 Sept 1998 | 30 Oct 2001 | American | 90 years |
| John William Smart | Secretary | 26 May 1989 | 31 Dec 1992 | British | - |
| Jonathan Michael Guttridge | Secretary | 5 Jan 2018 | 20 Apr 2018 | - | - |
| Jose Alberto Ibeas Franco | Director | 16 Dec 2011 | 3 Feb 2014 | Spanish | 54 years |
| Kara Elizabeth Major | Director | 1 Aug 2018 | 24 Sept 2018 | American | 49 years |
| Keith James Miller | Director | 8 Aug 2013 | 31 Mar 2022 | British | 58 years |
| Kenneth George Hanna | Director | 17 May 1995 | 31 Jul 1996 | British | 73 years |
| Kerryn Louise Haynes | Director | 11 Jun 2015 | 10 Sept 2018 | British | 56 years |
| Lord Macfarlane Of Bearsden | Director | 26 May 1989 | 10 May 1996 | British | 100 years |
| Lucie Charlotte Milburn | Director | 14 Sept 2021 | 20 Sept 2022 | British | 42 years |
| Mark David Peters | Secretary | 31 Mar 1998 | 10 Nov 2000 | British | - |
| Matthew John Lester | Director | 31 Jan 2003 | 31 Aug 2006 | British | 63 years |
| Michael Christopher Flynn | Director | 7 Apr 2005 | 15 Jun 2008 | British | 69 years |
| Nandor Makos | Director | 26 May 2006 | 1 Aug 2014 | Hungarian | 62 years |
| Nandor Szakolczai | Director | 30 Jun 2020 | 26 Sept 2022 | Hungarian | 48 years |
| Nicholas Charles Rose | Director | 1 Sept 1998 | 1 Jul 1999 | British | 69 years |
| Pablo Belgeri | Director | 8 Oct 2019 | 17 Dec 2019 | Italian | 56 years |
| Patrick Michael Heade | Director | 26 May 2006 | 10 Aug 2007 | Irish | 58 years |
| Paul Derek Tunnacliffe | Director | 7 Jan 2008 | 30 Jun 2016 | British | 64 years |
| Paul Steven Walsh | Director | 20 Apr 2000 | 9 Mar 2006 | British | 71 years |
| Paviter Singh Binning | Director | 18 Apr 2001 | 3 Oct 2003 | British | 66 years |
| Peter William Phillipson | Director | 1 Feb 1997 | 1 Sept 1998 | British | 72 years |
| Philip John Parnell | Director | 12 Mar 1993 | 1 Feb 1998 | British | 74 years |
| Phillip Baverstock Rhodes | Director | 26 May 1989 | 8 Sept 1989 | British | 80 years |
| Phillip Keague Bentley | Director | 1 Jul 1999 | 31 Oct 2000 | British | 67 years |
| Ravi Rajagopal | Director | 3 Oct 2003 | 7 Apr 2005 | British | 71 years |
| Raymond James Joy | Director | 20 Apr 2004 | 22 Jun 2007 | British | 72 years |
| Richard Arthur Hibbins | Director | 10 Mar 2008 | 30 Jun 2009 | British | 59 years |
| Richard James Bee | Director | 16 Mar 2010 | 26 Oct 2011 | British | 58 years |
| Robert Joseph Moore | Director | 30 Oct 2001 | 31 Jan 2003 | American | 65 years |
| Robert Walter Antoine Hermans | Director | 26 May 1989 | 31 Dec 1989 | Dutch | 92 years |
| Roger Hugh Myddelton | Director | 18 Dec 2000 | 31 Mar 2003 | British | 84 years |
| Ronald James Gilchrist | Secretary | 1 Jan 1993 | 31 Mar 1998 | British | - |
| Ronald Kerr Martin | Director | 26 May 1989 | 31 Oct 1991 | British | 95 years |
| Sharon Lynnette Fennessy | Director | 28 Sept 2018 | 9 Aug 2021 | Irish | 59 years |
| Shaun Coleman Dowling | Director | 26 May 1989 | 10 Jul 1992 | British | 95 years |
| Simon Patrick Duffy | Director | 19 Jul 1989 | 31 Jan 1992 | British | 77 years |
| Stephen John Bolton | Director | 1 Apr 2011 | 28 Sept 2018 | British | 64 years |
| Stuart Lorimer | Director | 29 Nov 2011 | 31 Dec 2014 | British | 60 years |
| Susanne Margaret Bunn | Director | 15 Mar 2002 | 4 Jan 2008 | British | 67 years |
| Victoria Cooper | Secretary | 5 Nov 2015 | 23 Mar 2017 | - | - |
| Walter Hunter Caldwell | Director | 1 Sept 1998 | 30 Apr 2002 | British | 79 years |
| Yvonne Elliott | Director | 28 Sept 2018 | 14 Sept 2021 | British | 46 years |