| Andrew Richard John Calvert | Director | 12 Feb 1997 | 27 Aug 1998 | British | 74 years |
| Brian Armstrong | Secretary | 1 Oct 1992 | 25 Feb 1994 | British | - |
| Brian Armstrong | Secretary | 1 Oct 1994 | 20 Feb 1995 | British | - |
| Brian Armstrong | Secretary | 1 Aug 1996 | 22 Oct 2001 | British | - |
| Charles William Hamshaw Thomas | Secretary | 25 Feb 1994 | 31 Jul 1996 | British | - |
| David George Bryant | Director | 3 May 2001 | 31 Dec 2009 | British | 73 years |
| David Jenkinson | Director | 1 May 2016 | 20 Sept 2020 | British | 58 years |
| David John Smith | Director | 20 Jan 1994 | 12 Feb 1997 | British | 67 years |
| David Norman Priest | Director | 1 Oct 1993 | 25 Feb 1994 | British | 78 years |
| Dennis Michael Webb | Director | 1 Oct 1992 | 28 Oct 1999 | British | 85 years |
| Geoffrey Grewer | Director | 15 Mar 2001 | 1 May 2002 | British | 83 years |
| Gerald Neil Francis | Director | 1 May 2002 | 30 Sept 2016 | British | 69 years |
| Jeffrey Fairburn | Director | 1 Jan 2010 | 31 Dec 2018 | British | 59 years |
| John David Low | Director | 15 May 1997 | 1 Jun 2001 | British | 81 years |
| John Millar | Director | 15 Mar 2001 | 30 Apr 2006 | British | 81 years |
| John Stuart Cadwallader | Director | 15 May 1997 | 5 Oct 2001 | British | 78 years |
| John White | Director | 15 Mar 2001 | 31 Dec 2009 | British | 74 years |
| Michael Hugh Killoran | Director | 15 Mar 2001 | 14 Jan 2022 | British | 64 years |
| Michael Peter Farley | Director | 15 Mar 2001 | 18 Apr 2013 | British | 72 years |
| Nicholas Howard Smith | Director | 2 Dec 1998 | 11 May 2001 | British | 68 years |
| Nigel Peter Greenaway | Director | 18 Apr 2013 | 30 Apr 2016 | British | 65 years |
| Richard Paul Stenhouse | Director | 30 Sept 2016 | 30 Sept 2021 | British | 54 years |
| Robert Longmuir Macfarlane | Director | 1 Oct 1992 | 16 Nov 1993 | British | 85 years |
| Stephen Murray | Director | 16 Nov 1993 | 20 Jan 1994 | British | 69 years |
| Stewart Antony Baseley | Director | 15 May 1997 | 26 Jun 1998 | British | 67 years |