| Albert Norman Dungate | Director | 17 Jun 2002 | 1 Dec 2015 | British | 70 years |
| Alexander James Marsh | Director | 14 Aug 2002 | 30 Sept 2008 | British | 80 years |
| Allan Keppie Smith | Director | 13 Dec 1988 | 18 May 1997 | British | 94 years |
| Andrew Patrick Kennedy | Secretary | 2 Aug 1990 | 2 Sept 1997 | British | - |
| Barry Morse | Director | 11 May 1993 | 1 Jun 1995 | British | 76 years |
| Ben Davey | Director | 21 Jan 2019 | 13 Jun 2019 | British | 61 years |
| Catherine Helena Cole | Director | 27 Nov 2024 | 11 Jun 2025 | British | 57 years |
| David Brian Ruff | Director | 19 Jan 2009 | 24 Aug 2010 | British | 68 years |
| David Frank Plester | Director | 31 May 2011 | 7 Jul 2015 | British | 62 years |
| David Stewart Batty | Director | 13 Dec 1988 | 18 Jun 1999 | British | 82 years |
| David Sydney Jackson | Director | 16 Jan 1991 | 31 Dec 1991 | British | 91 years |
| Derek Malcolm Jones | Director | 1 Apr 2017 | 25 Nov 2024 | British | 55 years |
| Erik Alexander Steven Porter | Director | 2 Aug 1990 | 1 Jul 1997 | British | 87 years |
| Franco Martinelli | Director | 15 Jul 2008 | 1 Dec 2015 | British | 66 years |
| Geoffrey Michael Adams | Director | 9 Jul 2015 | 31 Dec 2023 | British | 63 years |
| Geoffrey Price Hough | Director | 13 Dec 1988 | 24 Apr 1990 | British | 89 years |
| George Traill Lyon | Secretary | 2 Sept 1997 | 30 Jul 1999 | British | - |
| Godfrey Oliver Whitehead | Director | 2 Aug 1990 | 30 Apr 1993 | British | 85 years |
| Helen Margaret Mahy | Director | 19 Jun 2001 | 31 Jan 2002 | British | 65 years |
| Iain Stuart Urquhart | Director | 1 Dec 2015 | 31 May 2022 | British | 61 years |
| James Edward Barker | Director | 13 Dec 1988 | 14 Aug 1989 | British | 68 years |
| James Edward Barker | Secretary | 13 Dec 1988 | 14 Aug 1989 | British | - |
| James Richard Parker | Director | 11 Jul 2024 | 27 Nov 2024 | British | 49 years |
| Jeffrey Whalley | Director | 27 Jul 1989 | 2 Aug 1990 | British | 84 years |
| John David Taylor Greig | Secretary | 28 Apr 2000 | 3 Jun 2011 | Other | - |
| John Laurence Hakes | Director | 19 Jul 1990 | 2 Aug 1990 | British | 86 years |
| Karen Veronica Hayzen-smith | Director | 14 Nov 2016 | 13 Jan 2020 | British | 56 years |
| Kate Ellen Butler | Director | 7 Jul 2015 | 30 Apr 2019 | British | 66 years |
| Kenneth Leslie Cornfield | Director | 14 Jul 2015 | 1 Apr 2016 | British | 71 years |
| Kevin John Garvey | Director | 13 Jan 2020 | 12 Sept 2022 | British | 59 years |
| Kevin Richard Thomas | Director | 19 Nov 2002 | 24 Oct 2012 | British | 72 years |
| Mark David Lawton | Director | 24 Oct 2012 | 7 Jul 2015 | British | 54 years |
| Mark David Lawton | Director | 11 Jul 2017 | 24 Sept 2020 | British | 54 years |
| Michael Fellowes | Director | 10 Aug 2006 | 24 Aug 2010 | British | 68 years |
| Michael Noel Mckenna | Director | 29 Jul 1999 | 19 Jun 2001 | British | 82 years |
| Michael Noel Mckenna | Director | 3 Jun 2002 | 12 Sept 2003 | British | 82 years |
| Murray Simpson Easton | Director | 18 May 1997 | 31 May 2002 | British | 75 years |
| Neal Gregory Misell | Director | 1 Apr 2016 | 12 Sept 2022 | British | 59 years |
| Nicholas James William Borrett | Secretary | 27 Jul 2012 | 25 Feb 2013 | - | - |
| Nicholas Robin Salmon | Director | 5 Jul 1994 | 31 May 1997 | British | 74 years |
| Nigel John Russell | Director | 18 May 2004 | 19 Jan 2009 | British | 76 years |
| Nigel Robert Young | Director | 31 Jul 1997 | 30 Nov 2001 | British | 73 years |
| Peter Lloyd Rogers | Director | 17 Jun 2002 | 24 Oct 2012 | British | 79 years |
| Philip Henry Kay | Director | 19 Jun 2001 | 1 Apr 2004 | British | 82 years |
| Richard Duncan Stoate | Director | 24 Oct 2012 | 31 Mar 2018 | British | 63 years |
| Richard Hewitt Taylor | Director | 31 May 2011 | 13 Jul 2016 | British | 65 years |
| Robert Scott Martin | Secretary | 30 Jul 1999 | 28 Apr 2000 | British | - |
| Robert Scott Martin | Secretary | 19 Jun 2001 | 21 Apr 2004 | British | - |
| Robert Stewart | Director | 19 Jun 2001 | 27 Jul 2004 | British | 73 years |
| Roger Andrew Hardy | Director | 1 Dec 2015 | 31 Mar 2020 | British | 60 years |
| Shaun Doherty | Director | 18 May 2022 | 30 Sept 2024 | British | 58 years |
| Stanley Alan Royall Billiald | Secretary | 19 Nov 2002 | 1 Jul 2009 | Other | - |
| Stephen Ward | Director | 13 Jun 2019 | 7 Jun 2024 | British | 63 years |
| Steven Landrey | Director | 6 Sept 2016 | 1 Apr 2017 | British | 57 years |
| Sudhakar Anand Pandit | Director | 3 Mar 1992 | 13 Jun 1994 | British | 84 years |
| Thomas Alexander Hesketh | Director | 5 Jul 1994 | 1 Jul 1997 | British | 76 years |
| Thomas John Parker | Director | 5 Jul 1994 | 1 Jul 1997 | British | 84 years |
| Thomas Mayer | Director | 13 Dec 1988 | 2 Aug 1990 | British | 98 years |
| Valerie Francine Anne Teller | Secretary | 1 Jul 2009 | 27 Jul 2012 | British | - |
| William Alan Cramond | Director | 18 Jan 2001 | 27 Oct 2003 | British | 70 years |
| William Tame | Director | 22 Jan 2002 | 24 Oct 2012 | British | 72 years |