| Adrian Charles Morris | Director | 30 Apr 2021 | 12 Jul 2024 | British | 59 years |
| Adrian Richard Hill | Director | 19 Dec 2008 | 4 Dec 2013 | British | 68 years |
| Alan Ewing Mills | Secretary | 17 Apr 1997 | 19 Dec 2008 | British | - |
| Alan James Harris Stewart | Director | 16 Jan 2017 | 30 Apr 2021 | British | 66 years |
| Alan Wallace Mckean | Director | 5 Mar 1997 | 17 Apr 1997 | British | 72 years |
| Alison Horner | Director | 29 May 2009 | 17 Dec 2010 | British | 60 years |
| Amanda Jane Rendle | Director | 13 Dec 2016 | 31 May 2023 | British | 63 years |
| Andrew Thomas Higginson | Director | 27 Feb 1998 | 26 Feb 2012 | British | 69 years |
| Andrew William Dewhurst | Director | 17 Apr 1997 | 27 Feb 1998 | British | 67 years |
| Andrew William Dewhurst | Director | 28 Mar 2002 | 28 Nov 2003 | British | 67 years |
| Annette Elizabeth Court | Director | 25 Aug 2006 | 8 Nov 2006 | British | 64 years |
| Bernard Higgins | Director | 29 Aug 2008 | 28 Feb 2018 | British | 66 years |
| Bernard Higgins | Director | 27 Feb 1998 | 5 Jan 2006 | British | 66 years |
| Christopher Paul Sullivan | Director | 26 Mar 2004 | 19 Dec 2008 | British | 69 years |
| Colin George Smith | Director | 30 Jul 1999 | 27 Oct 2000 | British | 71 years |
| David Andrew Mccreadie | Director | 9 Dec 2015 | 20 Jun 2019 | British | 57 years |
| David Edward Reid | Director | 17 Apr 1997 | 27 Feb 1998 | British | 79 years |
| Deanna Watson Oppenheimer | Director | 17 Jul 2012 | 31 Dec 2016 | British | 68 years |
| Deborah Ann Walker | Director | 18 Jan 2022 | 1 Nov 2024 | British | 53 years |
| Declan Joseph Hourican | Director | 14 Nov 2016 | 29 Jun 2021 | Irish | 50 years |
| Derek Stephen Sach | Director | 17 Apr 1997 | 27 Feb 1998 | British | 78 years |
| Eric George William Tough | Director | 5 Mar 1997 | 17 Apr 1997 | British | 69 years |
| Feike Erik Brouwers | Director | 5 Aug 2015 | 23 Jan 2017 | Dutch | 59 years |
| Fiona Burden | Secretary | 1 Feb 2022 | 1 Nov 2024 | - | - |
| Gareth Richard Bullock | Director | 17 Jul 2012 | 9 Dec 2015 | British | 73 years |
| Gary John Duggan | Director | 1 Nov 2024 | 11 Feb 2025 | British | 65 years |
| George Anthony Schofield | Director | 24 Apr 1998 | 28 Nov 2003 | British | 86 years |
| Gerard Martin Mallon | Director | 13 Aug 2018 | 1 Nov 2024 | British | 57 years |
| Gordon Francis Pell | Director | 2 Feb 2007 | 19 Dec 2008 | British | 76 years |
| Graham Fenwick Pimlott | Director | 31 Mar 2008 | 17 Apr 2020 | British | 77 years |
| Hew Campbell | Director | 5 Mar 1997 | 17 Apr 1997 | British | 64 years |
| Iain Clink | Director | 28 Mar 2002 | 31 Jul 2008 | British | 68 years |
| Iain Clink | Director | 19 Dec 2008 | 24 Aug 2018 | British | 68 years |
| Ian Hugh Chippendale | Director | 27 Feb 1998 | 25 Aug 2006 | British | 77 years |
| Jacqueline Ferguson | Director | 26 Apr 2018 | 1 Nov 2024 | British | 56 years |
| James Henry Willens | Director | 12 May 2017 | 28 Sept 2021 | British | 70 years |
| James Mcconville | Director | 25 Nov 2014 | 1 Feb 2021 | British | 70 years |
| James Thomas Macdonald | Director | 26 Mar 2004 | 18 Aug 2006 | British | 67 years |
| John Castagno | Director | 1 Oct 2016 | 30 Sept 2019 | Italian | 68 years |
| John Michael Wemms | Director | 27 Feb 1998 | 30 Jul 1999 | British | 86 years |
| John Napier Allan | Director | 17 Apr 1997 | 27 Feb 1998 | British | 79 years |
| John Oliver Frank Kingman | Director | 1 Nov 2019 | 22 Jan 2023 | British | 57 years |
| John Reed | Director | 30 Mar 2011 | 13 Feb 2013 | British | 67 years |
| John William Melbourn | Director | 27 Mar 1998 | 31 Mar 2008 | British | 89 years |
| Jonathan Mark Lloyd | Secretary | 19 Dec 2008 | 13 May 2014 | British | - |
| Julie Louise Currie | Director | 1 Feb 2021 | 1 Nov 2024 | British | 52 years |
| Karl Robert Douglas Bedlow | Director | 29 Jan 2016 | 20 Jun 2019 | British | 59 years |
| Kenneth Ian Towle | Director | 14 Feb 2003 | 30 Jun 2005 | British | 62 years |
| Kevin Paul Grace | Director | 27 Oct 2000 | 4 Oct 2002 | British | 61 years |
| Laura Katharine Wade-gery | Director | 30 Apr 2004 | 28 Jan 2011 | British | 61 years |
| Michael William Mustard | Secretary | 13 May 2014 | 1 Feb 2022 | - | - |
| Newton Scott | Director | 17 Apr 1997 | 27 Feb 1998 | British | 80 years |
| Norman Cardie Mcluskie | Director | 17 Apr 1997 | 30 Nov 2007 | British | 82 years |
| Patricia Lynne Mitchell | Secretary | 1 Nov 2024 | 4 Jul 2025 | - | - |
| Paul William Hewitt | Director | 3 Oct 2012 | 1 May 2014 | British | 70 years |
| Paulette Georgina Rowe | Director | 19 Dec 2008 | 28 Aug 2009 | British | 60 years |
| Peter Douglas Bole | Director | 13 Dec 2011 | 3 Oct 2016 | British | 57 years |
| Prasanna Gopalakrishnan | Director | 10 Jan 2023 | 1 Sept 2024 | American | 56 years |
| Raymond Francis Pierce | Director | 24 Apr 2009 | 31 Dec 2017 | British | 80 years |
| Richard John Henderson | Director | 29 Mar 2017 | 1 Nov 2024 | British | 49 years |
| Ricky David Hunkin | Director | 28 Jan 2011 | 30 Jun 2014 | British | 64 years |
| Robert Duncan Endersby | Director | 5 Dec 2014 | 1 May 2025 | British | 67 years |
| Robert James Mackenzie Bulloch | Director | 29 Sept 2006 | 19 Dec 2008 | British | 65 years |
| Rowley Stuart Ager | Director | 17 Apr 1997 | 6 Feb 2004 | British | 81 years |
| Shaun Edward Doherty | Director | 19 Dec 2008 | 31 Aug 2012 | British | 68 years |
| Shirley Margaret Macgillivray | Secretary | 5 Mar 1997 | 17 Apr 1997 | British | - |
| Simon Christopher John Machell | Director | 12 Nov 2013 | 1 May 2025 | British | 63 years |
| Stuart John Chambers | Director | 17 Jul 2012 | 4 Feb 2014 | British | 70 years |
| Tikendra Patel | Director | 30 Dec 2021 | 1 Nov 2024 | British | 61 years |
| Timothy John Rollit Mason | Director | 17 Apr 1997 | 25 Aug 2006 | British | 69 years |
| Timothy Robert Ashdown | Director | 29 Dec 2005 | 23 Jul 2008 | British | 62 years |
| William Hill Main | Director | 30 Jan 2009 | 24 Jun 2011 | British | 83 years |
| William Scott Black | Director | 27 Feb 1998 | 26 Mar 2004 | British | 78 years |