| Andrew Christopher Bolter | Director | 3 Sept 2012 | 4 Apr 2014 | British | 56 years |
| Brian Jeffrey Howarth | Director | 12 Jul 1991 | 27 Dec 1995 | British | 85 years |
| Charles Anthony Wentzel | Secretary | 27 Dec 1995 | 21 Jun 1999 | British | - |
| Christopher Gordon Reynolds | Director | 5 Aug 2008 | 18 May 2009 | British | 73 years |
| Dallas Morton Pearce Taylor | Director | 27 Sept 1999 | 11 Apr 2002 | South African | 73 years |
| David Anthony Grady | Director | 18 May 2009 | 11 Jun 2010 | British | 57 years |
| David Bruce Moore | Director | 2 Jan 1997 | 14 May 1999 | British | 75 years |
| Deborah Grimason | Director | 28 Jun 2013 | 20 Nov 2013 | British | 63 years |
| Derek Wild | Director | 12 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 | 11 Apr 2002 | British | 77 years |
| Geoffrey Allan Wilkinson | Secretary | 21 Jun 1999 | 11 Apr 2002 | British | - |
| Invensys Secretaries Limited | Corporate Secretary | 21 Nov 1994 | 27 Dec 1995 | United Kingdom | - |
| James Demmink Thom | Director | 1 Mar 1995 | 20 Dec 1995 | British | 80 years |
| James Richard Stirk | Director | 11 Jun 2010 | 14 Dec 2012 | British | 67 years |
| Michael John Choules | Director | 15 Mar 2016 | 9 Apr 2021 | British | 66 years |
| Richard John Wood | Director | 9 Apr 2021 | 30 Sept 2022 | British | 54 years |
| Robert Anthony Yates | Director | 12 Jul 1991 | 10 Sept 2001 | British | 87 years |
| Robert Casson Brown | Director | 29 Nov 1994 | 20 Dec 1995 | British | 87 years |
| Robert Ian Walter Boyd | Secretary | 12 Jul 1991 | 21 Nov 1994 | British | - |
| Ruth Sarah Button | Director | 30 Sept 2022 | 1 Oct 2025 | British | 42 years |
| Tarmac Nominees Limited | Corporate Director | 11 Apr 2002 | 29 Jun 2013 | United Kingdom | - |
| Tarmac Nominees Two Limited | Corporate Director | 11 Apr 2002 | 29 Jun 2013 | United Kingdom | - |
| Tarmac Nominees Two Limited | Corporate Secretary | 11 Apr 2002 | 29 Jun 2013 | United Kingdom | - |