| Alan Leonard Whitnall | Secretary | 17 Jun 1997 | 29 May 2009 | British | - |
| Andrew Jacques Levy | Director | 5 Oct 2010 | 30 Jun 2019 | British | 63 years |
| Ann Heron Gloag | Director | 17 Jun 1997 | 20 Apr 1998 | British | 84 years |
| Arnold Mark Threapleton | Director | 18 Apr 2017 | 30 Jun 2020 | British | 72 years |
| Brian Souter | Director | 17 Jun 1997 | 20 Apr 1998 | British | 72 years |
| Carla Lucy Stockton-jones | Director | 1 Jul 2020 | 3 Jul 2023 | British | 54 years |
| Colin Brown | Director | 19 Nov 2002 | 30 Dec 2004 | British | 58 years |
| Colin Brown | Director | 4 Jul 2005 | 31 May 2019 | British | 58 years |
| Danny Elford | Director | 16 May 2022 | 28 Apr 2023 | British | 59 years |
| Derek Scott | Director | 29 Apr 1999 | 1 Sept 2004 | British | 73 years |
| Iain Maury Campbell Meiklejohn | Nominee Director | 17 Jun 1997 | 17 Jun 1997 | British | 72 years |
| Iain Maury Campbell Meiklejohn | Nominee Secretary | 17 Jun 1997 | 17 Jun 1997 | British | - |
| James Robert Will | Nominee Director | 17 Jun 1997 | 17 Jun 1997 | British | 71 years |
| Katrina Mary Leese | Director | 8 Nov 2005 | 15 Dec 2005 | British | 52 years |
| Keith Robertson Cochrane | Director | 17 Jun 1997 | 21 Jul 2002 | British | 61 years |
| Leslie Brian Warneford | Director | 21 Nov 2002 | 26 Apr 2013 | British | 78 years |
| Martin Andrew Griffiths | Director | 30 Dec 2004 | 8 Jan 2021 | British | 60 years |
| Michael John Kinski | Director | 20 Apr 1998 | 29 Apr 1999 | British | 74 years |
| Michael John Vaux | Secretary | 29 May 2009 | 30 Jul 2024 | British | - |
| Neil Micklethwaite | Director | 28 Oct 2019 | 30 Jun 2022 | British | 53 years |
| Nicola Susan Mary Salmond | Director | 1 Sept 2004 | 12 Feb 2010 | British | 50 years |
| Robert Arthur Benns | Director | 4 Oct 2010 | 16 Sept 2016 | British | 58 years |
| Robert Gervase Andrew | Director | 18 Apr 2017 | 30 Jun 2020 | British | 63 years |
| Robert Montgomery | Director | 5 Jul 2013 | 22 Mar 2017 | British | 74 years |
| Ross John Paterson | Director | 21 Jul 2002 | 1 Sept 2004 | British | 55 years |
| Ross John Paterson | Director | 8 Nov 2005 | 15 Dec 2005 | British | 55 years |
| Ross John Paterson | Director | 19 Jun 2006 | 8 Jan 2021 | British | 55 years |