| Andrew Christopher Bolter | Director | 3 Sept 2012 | 4 Apr 2014 | British | 56 years |
| Brian Jeffrey Howarth | Director | 13 Jul 1991 | 27 Dec 1995 | British | 85 years |
| Charles Anthony Wentzel | Secretary | 20 Dec 1995 | 29 Feb 2000 | British | - |
| David Anthony Grady | Director | 25 Nov 2009 | 11 Jun 2010 | British | 57 years |
| David Bruce Moore | Director | 20 Dec 1995 | 7 May 1999 | British | 75 years |
| David Connal Cather | Director | 18 Oct 1999 | 30 Sept 2006 | British | 67 years |
| Derek Green | Director | 13 Jul 1991 | 31 Jan 1992 | British | 86 years |
| Derek Wild | Director | 13 Jul 1991 | 31 Dec 1996 | British | 85 years |
| Fiona Puleston Penhallurick | Director | 4 Apr 2014 | 15 Mar 2016 | British | 59 years |
| Francis Keith John Jackson | Director | 13 May 1999 | 31 Mar 2005 | British | 77 years |
| Geoffrey Allan Wilkinson | Secretary | 29 Feb 2000 | 12 Dec 2006 | British | - |
| Guy Franklin Young | Director | 13 Jan 2014 | 31 Oct 2015 | South African | 57 years |
| Invensys Secretaries Limited | Corporate Secretary | 1 Feb 1995 | 20 Dec 1995 | United Kingdom | - |
| James Richard Stirk | Director | 11 Jun 2010 | 14 Dec 2012 | British | 67 years |
| James Richard Stirk | Secretary | 12 Dec 2006 | 25 Nov 2009 | British | - |
| John Christopher Hague | Director | 13 Jul 1991 | 20 May 1994 | British | 87 years |
| John Draper | Director | 20 Dec 1995 | 25 Aug 1998 | British | 85 years |
| Karim Hajjar | Director | 31 Mar 2005 | 25 Nov 2009 | British | 63 years |
| Kathleen Anne O'donovan | Director | 1 Dec 1994 | 20 Dec 1995 | British | 69 years |
| Kenneth Alfred Riley | Director | 1 Mar 1999 | 30 Nov 2002 | British | 85 years |
| Laurence Cant | Director | 27 Apr 1994 | 27 Dec 1995 | British | 84 years |
| Michael John Choules | Director | 12 Sept 2014 | 9 Apr 2021 | British | 66 years |
| Richard John Wood | Director | 9 Apr 2021 | 30 Sept 2022 | British | 54 years |
| Robert Casson Brown | Director | 1 Dec 1994 | 20 Dec 1995 | British | 87 years |
| Robert Ian Walter Boyd | Secretary | 13 Jul 1991 | 1 Feb 1995 | British | - |
| Robert Sinclair Robertson | Director | 25 Aug 1998 | 12 Dec 2006 | British | 75 years |
| Ruth Sarah Button | Director | 30 Sept 2022 | 1 Oct 2025 | British | 42 years |
| Tarmac Nominees Limited | Corporate Director | 12 Dec 2006 | 13 Jan 2014 | United Kingdom | - |
| Tarmac Nominees Two Limited | Corporate Director | 25 Nov 2009 | 13 Jan 2014 | United Kingdom | - |
| Tarmac Nominees Two Limited | Corporate Secretary | 25 Nov 2009 | 28 Jun 2013 | United Kingdom | - |