| PRISM COSEC LIMITED ACTIVE | Secretary | 20 Aug 2018 | | | | Highdown House, Yeoman Way, Worthing, West Sussex, BN99 3HH, United Kingdom |
| FRANCIS, Timothy Perry ACTIVE | Director | 01 Jan 2021 | | United States | December 1976 | Valmont Industries, Inc., 15000 Valmont Plaza, Omaha, Nebraska, 68154, United States |
| MASSEY, Roger Andrew ACTIVE | Director | 11 Feb 2011 | | United States | July 1969 | Valmont Industries, Inc., 15000 Valmont Plaza, Omaha, Nebraska, 68154, United States |
| ASHDOWN, Hannah RESIGNED | Secretary | 05 Jan 2001 | 17 Jul 2001 | | | 9 Gate Cottages, Old Common Road, Chorleywood, Hertfordshire, WD3 5LW |
| BUNYAN, Andrew John Paul RESIGNED | Secretary | 31 Jul 2003 | 30 Sep 2005 | | | 29 Dudley Gardens, Harrow, Middlesex, HA2 0DQ |
| LEE, Tony RESIGNED | Secretary | 14 Feb 2000 | 05 Jan 2001 | | | 8 Rossdale, Tunbridge Wells, Kent, TN2 3PG |
| MARRIOTT, Paul Roger RESIGNED | Secretary | 30 Sep 2005 | 31 Mar 2008 | | | 37 Park Road, Radlett, Hertfordshire, WD7 8EG |
| MORGAN, Sarah RESIGNED | Secretary | 17 Jul 2001 | 31 Jul 2003 | | | 59 Barnhurst Path, South Oxhey, Hertfordshire, WD19 6UE |
| PALFREEMAN, Anthony William Hodsman RESIGNED | Secretary | | 14 Feb 2000 | | | 23 Denner Road, Chingford, London, E4 7SQ |
| THORPE, Morag Elizabeth RESIGNED | Secretary | 31 Mar 2008 | 18 Mar 2010 | | | 17, Whittaker Court, Woodfield, Ashtead, Surrey, KT21 2RP, Uk |
| DAVID VENUS & COMPANY LLP RESIGNED | Secretary | 16 Aug 2010 | 20 Aug 2018 | | | 42-50, Hersham Road, Walton-On-Thames, Surrey, KT12 1RZ, United Kingdom |
| ATTWOOD, Brian Frederick RESIGNED | Director | | 30 Sep 1993 | | March 1938 | 44 Uplands Park Road, Enfield, Middlesex, EN2 7PT |
| BOURNE, Peter Alfred Charles RESIGNED | Director | | 31 Mar 1999 | | March 1936 | 171 Hurst Road, Sidcup, Kent, DA15 9AH |
| BUNYAN, Andrew John Paul RESIGNED | Director | 17 Mar 2005 | 30 Sep 2005 | | September 1970 | 29 Dudley Gardens, Harrow, Middlesex, HA2 0DQ |
| DALY, Noel RESIGNED | Director | 01 Sep 1993 | 08 Mar 1999 | | December 1951 | 30 Kellington Lane, Eggborough, Goole, Yorkshire, DN14 0LB |
| GIBSON, Ronald Jack Reid RESIGNED | Director | | 08 Mar 1999 | | February 1948 | 16 Redcrest Gardens, Camberley, Surrey, GU15 2DU |
| GOULDSTONE, Roger Philip RESIGNED | Director | | 08 Mar 1999 | | December 1952 | Lodge Cottage, Gosmore Hill Preston Road, Preston, Hertfordshire, SG4 7QR |
| GOWEN, Robert William RESIGNED | Director | 12 Jul 2010 | 11 Feb 2011 | England | September 1971 | Bridewell Gate, 9 Bridewell Place, London, EC4V 6AW, England |
| JAKSICH, Mark Charles RESIGNED | Director | 11 Feb 2011 | 31 Dec 2020 | United States | September 1957 | Valmont, One Valmont Plaza, 13815 First National Bank Parkway, Omaha, Nebraska, 68154-5215, United States |
| KEMPSTER, Jonathan RESIGNED | Director | 30 Oct 2007 | 12 Jul 2010 | England | January 1963 | Glaston Hill Lodge, Church Road, Eversley, Hampshire, RG27 0PX |
| LEE, Tony RESIGNED | Director | 22 Jul 1999 | 05 Jan 2001 | England | November 1964 | 8 Rossdale, Tunbridge Wells, Kent, TN2 3PG |
| LUTON, Mark RESIGNED | Director | 17 Mar 2005 | 30 Oct 2007 | | August 1970 | 52 Beechwood Avenue, Farnborough, Kent, BR6 7EY |
| MARRIOT, Paul Roger RESIGNED | Director | 02 Oct 2000 | 31 Mar 2008 | | March 1968 | 37 Park Road, Radlett, Hertfordshire, WD7 8EG |
| MCGEE, Ronald James RESIGNED | Director | 03 Jan 1993 | 31 Dec 1998 | | September 1944 | 16 Sandy Close, Hertford, Hertfordshire, SG14 2BB |
| NARCISO, John Peter RESIGNED | Director | 01 Apr 1999 | 17 Mar 2005 | | November 1947 | 52 Wood Dale, Great Baddow, Chelmsford, Essex, CM2 8EZ |
| NARCISO, John Peter RESIGNED | Director | 24 Nov 1998 | 21 Dec 1998 | | November 1947 | 52 Wood Dale, Great Baddow, Chelmsford, Essex, CM2 8EZ |
| PATEL, Jacqueline Joan RESIGNED | Director | 02 Jan 1994 | 31 May 1999 | | May 1946 | 164 Rivermeads, Stanstead Abbotts, Hertfordshire, SG12 8EF |
| PRITCHARD, Neil Bartley RESIGNED | Director | 31 Mar 2008 | 11 Aug 2008 | England | December 1971 | 80, Park Road, New Barnet, Herts, EN4 9QF, Uk |
| SCOTT, John Anthony RESIGNED | Director | | 31 Aug 1999 | | January 1942 | Highfields, Browns End Road, Broxted, Dunmow, Essex, CM6 2BE |
| SMALLEY, Robert Anthony RESIGNED | Director | 11 Aug 2008 | 11 Feb 2011 | England | January 1976 | 1, Carlbury Close, St Albans, Herts, AL1 5DR, Uk |
| SMITH, Martyn Douglas RESIGNED | Director | 01 Apr 1999 | 02 Oct 2000 | | January 1960 | 11 Shortway, Amersham, Buckinghamshire, HP6 6AQ |
| WATTS, Richard RESIGNED | Director | | 31 Mar 1999 | | July 1946 | Greenacres, Hamlet Hill, Roydon, Harlow, Essex, CM19 5LD |