| Alan Nicklin | Director | 8 Jun 1991 | 1 Jan 1993 | British | 91 years |
| Alan Tony Eckford | Director | 1 Jan 1993 | 30 Jun 1994 | British | 78 years |
| Alexander Clark | Director | 9 Jan 1995 | 30 Apr 1996 | British | 76 years |
| Amec Nominees Limited | Corporate Director | 30 Jun 1994 | 11 Aug 2020 | United Kingdom | - |
| Andrew Stuart Mclean | Director | 11 Aug 2020 | 31 Aug 2024 | British | 56 years |
| Arthur Mcquillan | Director | 9 Mar 1993 | 30 Jun 1994 | British | 92 years |
| Brendan Paul Tobin | Director | 9 Mar 1993 | 30 Jun 1994 | British | 91 years |
| Brian Noddings | Director | 8 Jun 1991 | 28 May 1993 | British | 80 years |
| Christopher Laskey Fidler | Director | 31 Aug 2009 | 22 Jul 2016 | British | 71 years |
| Christopher Laskey Fidler | Secretary | 16 Jun 2009 | 31 Aug 2009 | British | - |
| Colin Fellowes | Secretary | 8 Jun 1991 | 16 Jun 2009 | British | - |
| David Ernest George Manning | Director | 1 Jan 1993 | 5 Sept 1994 | British | 76 years |
| David Robson | Director | 18 Jan 1993 | 29 Jan 1993 | British | 81 years |
| Helen Morrell | Secretary | 4 Dec 2015 | 22 Feb 2017 | - | - |
| Iain Angus Jones | Secretary | 16 Feb 2018 | 12 Jun 2024 | - | - |
| Jennifer Ann Warburton | Director | 22 Jul 2016 | 16 Feb 2018 | British | 57 years |
| Jennifer Ann Warburton | Secretary | 22 Feb 2017 | 16 Feb 2018 | - | - |
| John Dean | Director | 9 Jun 1992 | 14 Oct 1992 | British | 86 years |
| John Martin Cull | Director | 8 Jun 1991 | 1 Jan 1993 | British | 88 years |
| Kim Andrea Hand | Secretary | 31 Aug 2009 | 4 Dec 2015 | British | - |
| Mark James Watson | Director | 16 Feb 2018 | 31 Dec 2020 | British | 62 years |
| Michael John Bardsley | Director | 30 Apr 1998 | 5 Apr 2001 | British | 82 years |
| Michael John Kersey | Director | 8 Jun 1991 | 9 Mar 1993 | British | 85 years |
| Nigel James Maxwell Davies | Director | 30 Jun 1994 | 15 Sept 1995 | British | 72 years |
| Peter James Holland | Director | 5 Apr 2001 | 31 Aug 2009 | British | 79 years |
| Peter John Rose | Director | 8 Jun 1991 | 9 Mar 1993 | British | 83 years |
| Peter Roy Davies | Director | 8 Jun 1991 | 30 Jun 1994 | British | 80 years |
| Ronald Frederick Turner | Director | 30 Jun 1994 | 30 Apr 1996 | British | 78 years |
| Ronald Frederick Turner | Director | 1 May 1996 | 30 Apr 1998 | British | 78 years |
| Stephen John Challen | Director | 8 Jun 1991 | 30 Jun 1994 | British | 76 years |
| William Savage | Director | 8 Jun 1991 | 30 Apr 1992 | British | 90 years |