| Alan Philip Scott | Director | 21 Dec 2010 | 10 Dec 2012 | British | 60 years |
| Alan Roy Cussen | Director | 11 Jul 1990 | 1 May 1991 | British | 90 years |
| Andrew Forrest Brown Simpson | Director | 1 Jan 1994 | 30 Apr 1999 | British | 82 years |
| Brian George Williams | Director | 11 Jul 1990 | 9 Oct 1992 | British | 80 years |
| Brian Grant Gilchrist | Director | 23 Aug 1993 | 30 Jun 1995 | British | 88 years |
| Charles Nicholas Pollard | Director | 22 Oct 2014 | 1 Jul 2015 | British | 68 years |
| Christopher Findlay Morgan | Director | 23 Feb 2010 | 30 Mar 2012 | British | 55 years |
| David Andrew Bruce | Director | 13 Jun 2017 | 25 Jan 2019 | British | 55 years |
| David John Donaldson | Director | 30 Jan 2013 | 15 Aug 2014 | British | 74 years |
| David Michael Grist | Director | 8 Feb 1999 | 22 Apr 2009 | British | 78 years |
| David Munro Ross | Director | 1 Jan 1994 | 8 Jan 1998 | British | 76 years |
| Dean John Banks | Director | 8 Jun 2015 | 25 Jan 2019 | British | 55 years |
| Ewan Thomas Anderson | Director | 31 Jan 2012 | 21 May 2013 | British | 60 years |
| Ewan Thomas Anderson | Director | 30 May 2014 | 14 Apr 2015 | British | 60 years |
| Garry Rankine Black | Director | 10 Mar 2008 | 22 Apr 2009 | British | 65 years |
| Gillian Scott Murray Mcniven | Director | 11 Oct 2012 | 14 May 2014 | British | 61 years |
| Graeme Taylor | Director | 1 Oct 1991 | 22 Feb 1999 | British | 74 years |
| Gregory William Mutch | Secretary | 11 Jul 1990 | 30 Sept 2015 | British | - |
| Ian Carroll | Director | 11 Jul 1990 | 30 Nov 1994 | British | 93 years |
| Ian Kenneth Smith | Director | 13 Jun 2017 | 13 May 2022 | British | 58 years |
| James Jack Macnaughtan | Director | 23 Aug 1993 | 4 Nov 1998 | British | 85 years |
| James Joseph Duffy | Director | 13 Jun 2017 | 25 Jan 2019 | British | 60 years |
| John Cooperwhite Moore | Director | 1 Sept 2004 | 31 Jan 2012 | British | 67 years |
| John Dunwoodie | Director | 11 Jul 1990 | 4 Nov 1998 | British | 79 years |
| John Lees Judge | Director | 11 Jul 1990 | 31 Mar 1994 | British | 94 years |
| John Stewart Barron | Director | 5 Feb 2013 | 30 Jun 2014 | British | 69 years |
| Lindsay Mcgibbon | Director | 8 Aug 2022 | 8 Aug 2022 | British | 59 years |
| Mark Andrews | Director | 1 Feb 1997 | 31 Mar 2000 | British | 67 years |
| Mark Edward Hoyland | Director | 28 Aug 2014 | 26 Aug 2016 | British | 56 years |
| Mark William Bullock | Director | 24 Aug 2022 | 31 Dec 2023 | British | 63 years |
| Michael John Auckland | Director | 1 May 2009 | 23 Feb 2010 | British | 67 years |
| Michael John Peasland | Director | 1 Feb 1999 | 1 Sept 2004 | British | 74 years |
| Michael William Welton | Director | 31 Jan 1996 | 6 Sept 1999 | British | 80 years |
| Nicholas James Bainbridge | Director | 1 Jul 1995 | 17 Mar 1999 | British | 79 years |
| Paul John Lester | Director | 9 Sept 1999 | 19 May 2002 | British | 77 years |
| Peter James Mason | Director | 30 Nov 1994 | 31 Jan 1996 | British | 80 years |
| Philip Frank Kenneth Ellis | Director | 16 Jan 2017 | 29 Apr 2022 | British | 61 years |
| Phillip Mcguire | Director | 21 Jan 2013 | 12 Jun 2014 | British | 66 years |
| Richard Robertson Mcculloch | Director | 11 Jul 1990 | 10 Sept 1993 | British | 83 years |
| Robert Alan Jones | Director | 11 Jul 1990 | 31 Oct 1991 | British | 96 years |
| Robert Clark | Director | 5 Feb 2013 | 29 Aug 2014 | British | 69 years |
| Robert Ian Maclean | Director | 31 Mar 2000 | 10 May 2000 | British | 67 years |
| Robert Lundy | Director | 11 Jul 1990 | 30 Dec 1999 | British | 85 years |
| Robert Mark Griffiths | Director | 20 Sept 1999 | 21 May 2013 | British | 73 years |
| Simon Charles Kirkpatrick | Director | 14 Apr 2015 | 16 Jan 2017 | British | 48 years |
| Simon Lafferty | Director | 16 Jan 2017 | 26 Nov 2021 | British | 56 years |
| Stanley Adrian Sellers | Director | 6 Sept 1993 | 31 Jan 1997 | British | 77 years |
| Stephen John Tarr | Director | 5 Feb 2013 | 16 Jan 2017 | British | 67 years |
| Stephen Michael Tough | Director | 13 May 2014 | 31 Oct 2016 | British | 54 years |
| Uma Shanker | Director | 11 Aug 2014 | 26 Jun 2015 | British | 54 years |
| William John Muirhead | Director | 11 Jul 1990 | 10 Feb 1994 | British | 79 years |