| Alan Duke Brown | Director | 18 Apr 1995 | 1 Mar 2004 | British | 65 years |
| Alan Duke Brown | Director | 11 Sept 2006 | 30 Apr 2018 | British | 65 years |
| Alan Victor Middlemist Donoghue | Director | 18 Apr 1995 | 1 Mar 2004 | British | 71 years |
| Alan Wood Downie | Director | 4 Sept 1991 | 16 Dec 2009 | British | 75 years |
| Alasdair Murray Macconnell | Director | 21 Aug 2007 | 16 Dec 2009 | British | 66 years |
| Alexander Ledingham | Director | 9 Nov 1988 | 31 Oct 1996 | British | 94 years |
| Andrew Charles Wagstaff | Director | 1 Jul 2022 | 14 Mar 2025 | English | 54 years |
| Anthony John Kelley | Director | 9 Nov 1988 | 29 Dec 1995 | British | 81 years |
| Brian Johnson | Director | 1 Jan 2023 | 27 Sept 2024 | British | 53 years |
| Catherine Scott Turnbull | Director | 19 Jul 2001 | 1 Mar 2004 | British | 74 years |
| Catherine Scott Turnbull | Director | 11 Sept 2006 | 24 Mar 2016 | British | 74 years |
| David John Gill | Director | 1 Jul 1996 | 1 Mar 2004 | British | 75 years |
| David John Gill | Director | 11 Sept 2006 | 12 Sept 2007 | British | 75 years |
| David Thomas Mcgrath | Director | 2 Mar 2020 | 5 Aug 2022 | Irish | 46 years |
| Donald Stewart Mackay | Director | 1 Sept 2000 | 1 Mar 2004 | British | 82 years |
| Duncan Malcolm Maccuish | Director | 1 Sept 2000 | 1 Mar 2004 | British | 79 years |
| Geoffrey Arthur Ball | Director | 9 Nov 1988 | 16 Dec 2009 | British | 82 years |
| Geoffrey Piers Banfield | Director | 1 Jan 2019 | 31 Dec 2023 | British | 57 years |
| Gerald Campbell More | Director | 18 Apr 1995 | 8 Nov 1996 | British | 64 years |
| Gerald Campbell More | Director | 8 Oct 1997 | 1 Mar 2004 | British | 64 years |
| Gerry Campbell More | Director | 11 Sept 2006 | 31 Mar 2011 | British | 64 years |
| Graham Alan Cunningham | Director | 9 Apr 2015 | 1 Aug 2018 | British | 51 years |
| James Robert Lidgate | Director | 1 Jan 2019 | 10 Mar 2020 | British | 47 years |
| Jennifer Wylie | Director | 12 Oct 2018 | 30 Apr 2025 | British | 41 years |
| John Graham Gunn Reid | Director | 9 Apr 2001 | 31 Oct 2018 | British | 61 years |
| Ledingham Chalmers Llp | Corporate Secretary | 9 Nov 1988 | 10 Aug 2001 | United Kingdom | - |
| Moira Ramsay Sibbald | Director | 20 Nov 2009 | 13 Mar 2018 | Scottish | 67 years |
| Moira Ramsay Sibbald | Secretary | 10 Aug 2001 | 24 Jul 2017 | Scottish | - |
| Neil John Stoddart | Director | 30 Apr 2018 | 1 Sept 2025 | British | 56 years |
| Nicholas Paul Twine | Director | 1 Jan 2019 | 1 Jul 2022 | British | 71 years |
| Robert James Millar | Director | 18 Apr 1995 | 27 Apr 2015 | British | 72 years |
| Robert John Westwater Dick | Director | 9 Nov 1988 | 2 Dec 2008 | British | 70 years |
| Ronald George Hanna | Director | 9 Nov 1988 | 31 Jan 1992 | British | 83 years |
| Stephen James Rosier | Director | 9 Nov 1991 | 9 Nov 1993 | British | 70 years |
| Tracey Anne Ashworth-davies | Director | 25 Jul 2017 | 10 May 2019 | British | 63 years |