| SMITH, Graham Richard ACTIVE | Secretary | 15 Oct 2014 | | | | Office 3a Capital Tower, 91 Waterloo Road, London, SE1 8RT, England |
| LIMA SOLLERO, Alberto ACTIVE | Director | 11 Nov 2025 | | England | September 1981 | Office 3a Capital Tower, 91 Waterloo Road, London, SE1 8RT, England |
| ROOSENSCHOON, Emile ACTIVE | Director | 01 Oct 2025 | | England | February 1984 | Office 3a Capital Tower, 91 Waterloo Road, London, SE1 8RT, England |
| SIDDIQI, Saad Naved ACTIVE | Director | 11 Nov 2025 | | England | September 1978 | Office 3a Capital Tower, 91 Waterloo Road, London, SE1 8RT, England |
| CIESIELSKA, Katarzyna Jolanta RESIGNED | Secretary | 07 Mar 2013 | 15 Oct 2014 | | | 100, Rue De Volmerange, Dudelange, Luxembourg |
| CUBITT, Michael Harry RESIGNED | Secretary | 04 Jun 2003 | 31 Dec 2010 | | | 22 Landen Grove, Wokingham, Berkshire, RG41 1LL |
| FORSYTHE, Andrew RESIGNED | Secretary | 20 Apr 2001 | 01 Aug 2001 | | | Pine Lodge, 2b Coral Close, Burbage Hinckley, Leicestershire, LE10 2HB |
| GOULDING, Graham Thomas RESIGNED | Secretary | 01 Aug 2001 | 25 Apr 2003 | | | 126 Auckland Road, London, SE19 2RP |
| MORTIMER, Jonathan RESIGNED | Secretary | 31 Dec 2010 | 05 Mar 2013 | | | Harsco House Regent Park, 299 Kingston Road, Leatherhead, Surrey, KT22 7SG |
| NAPIER, Graham Charles RESIGNED | Secretary | | 01 Sep 1993 | | | The Brambles, 273 Hayes Lane, Kenley, Surrey, CR8 5EJ |
| RICHARDSON, Elaine RESIGNED | Secretary | 30 Sep 2000 | 20 Apr 2001 | | | The Willows Willowside, London Colney, St Albans, Hertfordshire, AL2 1DP |
| SCULL, Andrew James RESIGNED | Secretary | 01 Jul 1997 | 30 Sep 2000 | | | 2 The Granary Brickwall Farm, Kiln Lane Clophill, Bedford, Bedfordshire, MK45 4DA |
| WOODWARD, Keith RESIGNED | Secretary | 01 Sep 1993 | 01 Jul 1997 | | | 62 Thomas More House, Barbican, London, EC2Y 8BT |
| BARRETT, John William RESIGNED | Director | 11 Jun 2003 | 31 May 2010 | England | February 1947 | 6 Blythewood Close, Knowle, Solihull, West Midlands, B91 3HL |
| BARTON, Charles Richard RESIGNED | Director | 27 Jul 1994 | 13 Jun 1996 | | April 1950 | 38 Rusholme Road, London, SW15 3LG |
| BAYLES, Geoffrey Francis RESIGNED | Director | | 25 Jun 1993 | United Kingdom | January 1939 | Valley House, 6 Boyce Farm Road, Thames Ditton, Surrey, KT7 0TS |
| BECK, Edgar Philip, Sir RESIGNED | Director | 21 Jul 1993 | 12 Jun 1995 | | August 1934 | Pylle Manor, Pylle, Shepton Mallet, Somerset, BA4 6TD |
| BROMLEY-MARTIN, Robin Hampden RESIGNED | Director | 21 Jul 1993 | 03 Mar 1995 | | October 1952 | Harsfold Farmhouse, Wisborough Green, West Sussex, RH14 0BD |
| BUNGAY, John RESIGNED | Director | 30 Nov 1994 | 01 Nov 1997 | | February 1953 | The Loft House Tandridge Court, Tandridge, Oxted, Surrey, RH8 9NJ |
| BURNS, Roderick RESIGNED | Director | 10 Dec 2010 | 03 Oct 2011 | England | December 1966 | Harsco House Regent Park, 299 Kingston Road, Leatherhead, Surrey, KT22 7SG |
| BUTLER, Geoffrey Doy Hopson RESIGNED | Director | 30 Sep 2000 | 31 Dec 2010 | England | October 1946 | Home Green Heath House Road, Worplesdon Hill, Woking, Surrey, GU22 0QU |
| CARDELL, Peter Julian Southwell RESIGNED | Director | 27 Mar 1996 | 01 Nov 1997 | | January 1948 | 115 Copers Cope Road, Beckenham, Kent, BR3 1NY |
| COOPER, Stephen Richard RESIGNED | Director | 10 Jun 2014 | 01 Oct 2025 | England | December 1966 | Office 3a Capital Tower, 91 Waterloo Road, London, SE1 8RT, England |
| LECLERCQ, Herve Michal RESIGNED | Director | 03 Oct 2011 | 10 Jun 2014 | United Kingdom | June 1962 | Harsco House Regent Park, 299 Kingston Road, Leatherhead, Surrey, KT22 7SG |
| MACDONALD, Alexander James RESIGNED | Director | 10 Dec 2010 | 10 Jun 2014 | United Kingdom | December 1954 | Harsco House Regent Park, 299 Kingston Road, Leatherhead, Surrey, KT22 7SG |
| MANSELL, Kenneth Leslie RESIGNED | Director | 21 Jul 1993 | 30 Jun 2000 | | April 1943 | Caramba Ashdown Place, Forest Row, East Sussex, RH18 5LP |
| MARSHALL, John Roger RESIGNED | Director | 21 Jul 1993 | 19 Oct 1995 | | April 1944 | 24 Albert Road, Teddington, Middlesex, TW11 0BD |
| MCGALPINE, Christopher RESIGNED | Director | 10 Dec 2010 | 10 Jun 2014 | England | May 1962 | Harsco House Regent Park, 299 Kingston Road, Leatherhead, Surrey, KT22 7SG |
| NAPIER, Graham Charles RESIGNED | Director | 01 Jan 1993 | 01 Sep 1993 | | May 1933 | The Brambles, 273 Hayes Lane, Kenley, Surrey, CR8 5EJ |
| O'KELLY, Paul Brian RESIGNED | Director | 10 Dec 2010 | 05 Dec 2011 | United Kingdom | December 1957 | Harsco House Regent Park, 299 Kingston Road, Leatherhead, Surrey, KT22 7SG |
| REITEMEIER, Christophe Nicolas RESIGNED | Director | 06 Nov 2020 | 02 Dec 2025 | England | December 1965 | Office 3a Capital Tower, 91 Waterloo Road, London, SE1 8RT, England |
| SAINSBURY, Roger Norman RESIGNED | Director | 21 Jul 1993 | 31 Dec 1995 | United Kingdom | June 1940 | 88 Dukes Avenue, Muswell Hill, London, N10 2QA |
| SCULL, Andrew James RESIGNED | Director | 01 Nov 1997 | 30 Sep 2000 | | April 1956 | 2 The Granary Brickwall Farm, Kiln Lane Clophill, Bedford, Bedfordshire, MK45 4DA |
| STOKELL, Robert RESIGNED | Director | 28 Oct 1996 | 30 Sep 2000 | | July 1945 | Kimbers 6 Wheatfield Avenue, West Common, Harpenden, Hertfordshire, AL5 2NU |
| WATKINS, Brian John RESIGNED | Director | 21 Jul 1993 | 30 Jun 1994 | United Kingdom | September 1937 | 8 Ormonde Road, Moor Park, Northwood, Middlesex, HA6 2EL |
| WEBB, David Dellmont RESIGNED | Director | 21 Jul 1993 | 05 Oct 1995 | | January 1949 | 1 The Stables, Langton Long, Blandford, Dorset, DT11 9HR |
| WHISTLER, Christopher Claude Lashmer RESIGNED | Director | 18 Sep 2000 | 31 Dec 2020 | England | June 1958 | Harsco House Regent Park, 299 Kingston Road, Leatherhead, Surrey, KT22 7SG |
| WIGG, Christopher Graham RESIGNED | Director | | 19 Apr 1996 | | March 1951 | 169 Worple Road, London, SW20 8RQ |
| YAPP, Stephen RESIGNED | Director | 01 Nov 1997 | 30 Sep 2000 | England | May 1957 | 4 The Tovells, Off School Lane Ufford, Woodbridge, Suffolk, IP13 6HF |
| ZAMAN, Shaima RESIGNED | Director | 05 Dec 2024 | 11 Nov 2025 | England | December 1976 | Office 3a Capital Tower, 91 Waterloo Road, London, SE1 8RT, England |