| COOPER, Stephen Richard ACTIVE | Director | 12 Jun 2014 | | England | December 1966 | Anglia House 6, Central Avenue, St Andrews Business Park, Norwich, NR7 0HR |
| GOULDING, Graham Thomas RESIGNED | Secretary | 07 Jun 1998 | 25 Apr 2003 | | | 126 Auckland Road, London, SE19 2RP |
| KIRKUP, David RESIGNED | Secretary | 04 Jan 1993 | 07 Jun 1998 | | | 316 Herringthorpe Valley Road, Rotherham, South Yorkshire, S65 3AB |
| WHISTLER, Christopher Claude Lashmer RESIGNED | Secretary | 04 Jun 2003 | 31 Dec 2020 | | | Harsco House, Regent Park, 299 Kingston Road Leatherhead, Surrey, KT22 7SG |
| WOOLASS, Stanley David RESIGNED | Secretary | | 30 Sep 1992 | | | 17 Ribblesdale Drive, Ridgeway, Sheffield, South Yorkshire, S12 3XB |
| BOUGHTON, Roger Francis RESIGNED | Director | | 31 Dec 2006 | | January 1946 | College Hill House, College Hill, Shrewsbury, SY1 1LZ |
| BUTLER, Geoffrey Doy Hopson RESIGNED | Director | 07 Jun 1998 | 31 Dec 2010 | England | October 1946 | Home Green Heath House Road, Worplesdon Hill, Woking, Surrey, GU22 0QU |
| COATSWORTH, Arthur RESIGNED | Director | | 10 Jul 1996 | | July 1951 | 12 Priory Close, Leighton, Crewe, Cheshire, CW1 3YJ |
| CUBITT, Michael Harry RESIGNED | Director | 07 Jun 1998 | 31 Dec 2010 | United Kingdom | July 1948 | 22 Landen Grove, Wokingham, Berkshire, RG41 1LL |
| FEAVIOUR, Roger St Denis RESIGNED | Director | | 05 Jun 1998 | England | November 1946 | Hazeley House, High Street Chieveley, Newbury, Berkshire, RG20 8UX |
| HOAD, Martin Roger Gregory RESIGNED | Director | 10 Dec 2010 | 01 Nov 2011 | United Kingdom | November 1965 | Harsco House, Regent Park, 299 Kingston Road Leatherhead, Surrey, KT22 7SG |
| KIRKUP, David RESIGNED | Director | 04 Jan 1993 | 31 Jan 2007 | England | August 1952 | 316 Herringthorpe Valley Road, Rotherham, South Yorkshire, S65 3AB |
| LECLERCQ, Herve Michal RESIGNED | Director | 03 Oct 2011 | 16 Dec 2013 | United Kingdom | June 1962 | Harsco House, Regent Park, 299 Kingston Road Leatherhead, Surrey, KT22 7SG |
| MINNIKIN, Leonard Anthony RESIGNED | Director | 02 Mar 1992 | 30 Apr 1996 | | January 1950 | 1 Thornleys, Cherry Burton, Beverley, North Humberside, HU17 7SJ |
| OAKES, Paul Harry RESIGNED | Director | 03 Oct 2011 | 01 Jul 2014 | United Kingdom | November 1957 | Harsco House, Regent Park, 299 Kingston Road Leatherhead, Surrey, KT22 7SG |
| PREST, Richard Jullion RESIGNED | Director | | 10 Dec 1991 | | May 1946 | Gardens House, Thoresby Park, Newark, Nottinghamshire, NG22 9EH |
| REITEMEIER, Christophe Nicolas RESIGNED | Director | 06 Nov 2020 | 21 Jul 2022 | England | December 1965 | Carlton House, Regent Park, 299 Kingston Road, Leatherhead, Surrey, KT22 7SG, England |
| STUBBS, Graham Martin RESIGNED | Director | 10 Dec 2010 | 01 Jul 2014 | United Kingdom | February 1954 | Harsco House, Regent Park, 299 Kingston Road Leatherhead, Surrey, KT22 7SG |
| SWAYNE, Anthony William John RESIGNED | Director | | 07 Jun 1998 | United Kingdom | September 1948 | The Old Vicarage, East Meon, Petersfield, Hampshire, GU32 1PG |
| WHISTLER, Christopher Claude Lashmer RESIGNED | Director | 10 Dec 2010 | 31 Dec 2020 | England | June 1958 | Harsco House, Regent Park, 299 Kingston Road Leatherhead, Surrey, KT22 7SG |