| HOGAN, Sean Lee ACTIVE | Director | 01 May 2015 | | Usa | May 1971 | C/O Halco Rock Tools Limited, Armytage Road, Brighouse, West Yorkshire, HD6 1QF |
| COHEN, Eric I RESIGNED | Secretary | 24 Jan 2006 | 19 Feb 2010 | | | 32, Burnham Hill Road, Westport, Connecticut, 06880, Fairfield, Usa |
| COWAN, Jonathan Brandon RESIGNED | Secretary | 11 Apr 1996 | 24 Jan 2006 | | | 17 Murieston Road, Hale, Altrincham, Cheshire, WA15 9SU |
| FRASER, David RESIGNED | Secretary | 26 Sep 2014 | 31 Mar 2015 | | | C/O Halco Rock Tools Limited, Armytage Road, Brighouse, West Yorkshire, HD6 1QF |
| NICHOLLS, Janette Margaret RESIGNED | Secretary | 08 Jul 2011 | 26 Sep 2014 | | | C/O Halco Rock Tools Limited, Armytage Road, Brighouse, West Yorkshire, HD6 1QF, England |
| COBBETTS (SECRETARIAL) LIMITED RESIGNED | Secretary | 19 Feb 2010 | 08 Jul 2011 | | | C/O Cobbetts Llp, 58 Mosley Street, Manchester, M2 3HZ, United Kingdom |
| DLA SECRETARIAL SERVICES LIMITED RESIGNED | Nominee Secretary | 01 Nov 1995 | 11 Apr 1996 | | | Fountain Precinct, Balm Green, Sheffield, South Yorkshire, S1 1RZ |
| BENNETT, Anthony James RESIGNED | Director | 11 Apr 1996 | 08 Jan 1997 | | June 1938 | Ladstone Windle Royd Lane, Warley, Halifax, West Yorkshire, HX2 7RX |
| BURROUGHS, Nigel John RESIGNED | Director | 08 Jul 2011 | 26 Sep 2014 | England | July 1964 | C/O Halco Rock Tools Limited, Armytage Road, Brighouse, West Yorkshire, HD6 1QF, England |
| CLEAVER, Michael David RESIGNED | Director | 30 Nov 2012 | 01 Oct 2014 | England | April 1968 | Shared Services, Eastfield, Peterborough, PE1 5NA, England |
| COHEN, Eric I RESIGNED | Director | 24 Jan 2006 | 19 Feb 2010 | United States | October 1958 | 32, Burnham Hill Road, Westport, Connecticut, 06880, Fairfield, Usa |
| COWAN, Jonathan Brandon RESIGNED | Director | 11 Apr 1996 | 24 Jan 2006 | England | June 1953 | 17 Murieston Road, Hale, Altrincham, Cheshire, WA15 9SU |
| DEFEO, Ronald Matthew RESIGNED | Director | 24 Jan 2006 | 19 Feb 2010 | United States | March 1952 | 45 Beachside Avenue, Westport, Connecticut 06880, IRISH, Usa |
| DOBNEY, Laurence Michael RESIGNED | Director | 08 Jul 2011 | 30 Nov 2012 | United Kingdom | July 1954 | Halco Drilling International Limited, West Lane, Southowram, Halifax, West Yorkshire, HX3 9TW, United Kingdom |
| FORBES, Ian Redfern RESIGNED | Director | 11 Apr 1996 | 24 Jan 2006 | England | February 1946 | Lilac Cottage, Hirst Courtney, Selby, North Yorkshire, YO8 8QT |
| GARTSIDE, John Willoughby RESIGNED | Director | 11 Apr 1996 | 18 Jun 2003 | | July 1947 | 15 The Ghyll, Fixby, Huddersfield, West Yorkshire, HD2 2FE |
| HOWARD, Philip RESIGNED | Director | 11 Apr 1996 | 19 Jun 2003 | | October 1939 | The Grange, 48 Lightridge Road Fixby, Huddersfield, West Yorkshire, HD2 2HL |
| HUGHES, Norman Peter RESIGNED | Director | 11 Apr 1996 | 19 Jun 2003 | | November 1945 | Dalmore White Edge Drive, Baslow, Bakewell, Derbyshire, DE45 1SJ |
| MACKUS, Craig Richard RESIGNED | Director | 19 Feb 2010 | 08 Jul 2011 | Usa | March 1952 | Halco Drilling International Limited, West Lane, Southowram, Halifax, West Yorkshire, HX3 9TW, United Kingdom |
| REINSTEIN, Michael Alan RESIGNED | Director | 01 Jan 2016 | 23 Mar 2016 | United States | September 1971 | C/O Halco Rock Tools Limited, Armytage Road, Brighouse, West Yorkshire, HD6 1QF |
| SRINATH, Srinivasa Rangan RESIGNED | Director | 01 Feb 2012 | 01 Oct 2014 | Usa | July 1958 | C/O Halco Rock Tools Limited, Armytage Road, Brighouse, West Yorkshire, HD6 1QF, England |
| STEINHAFEL, David RESIGNED | Director | 25 Mar 2015 | 02 May 2015 | Usa | May 1984 | C/O Halco Rock Tools Limited, Armytage Road, Brighouse, West Yorkshire, HD6 1QF |
| SULLIVAN, Timothy William RESIGNED | Director | 19 Feb 2010 | 08 Jul 2011 | Usa | June 1953 | Halco Drilling International Limited, West Lane, Southowram, Halifax, West Yorkshire, HX3 9TW, United Kingdom |
| THOMPSON, Richard Terry Alexander RESIGNED | Director | 23 Jan 1997 | 09 Jul 1997 | United Kingdom | August 1944 | Llanerchgron Barn, Pwllglas, Ruthin, Clwyd, LL15 2PL |
| WIDMAN, Phillip Charles RESIGNED | Director | 24 Jan 2006 | 19 Feb 2010 | Usa | June 1954 | 25 Old Stone Crossing, West Simsbury, Connecticut 06092, Usa |
| WINGATE, Richard Alan RESIGNED | Director | 01 Feb 2012 | 31 Mar 2015 | United Kingdom | July 1967 | C/O Halco Rock Tools Limited, Armytage Road, Brighouse, West Yorkshire, HD6 1QF, England |
| DLA NOMINEES LIMITED RESIGNED | Nominee Director | 01 Nov 1995 | 11 Apr 1996 | | | Fountain Precinct, Balm Green, Sheffield, South Yorkshire, S1 1RZ |
| DLA SECRETARIAL SERVICES LIMITED RESIGNED | Nominee Director | 01 Nov 1995 | 11 Apr 1996 | | | Fountain Precinct, Balm Green, Sheffield, South Yorkshire, S1 1RZ |