| DUNCOMBE, Fiona Margaret ACTIVE | Secretary | 02 Jan 2013 | | | | 80, Fenchurch Street, London, EC3M 4BY, United Kingdom |
| SHAH, Sunil ACTIVE | Secretary | 27 Jan 2025 | | | | 80, Fenchurch Street, London, EC3M 4BY, United Kingdom |
| DENNETT, Paul ACTIVE | Director | 07 Jun 2024 | | United Kingdom | March 1971 | 80, Fenchurch Street, London, EC3M 4BY, United Kingdom |
| HOGG, Peter William ACTIVE | Director | 01 Feb 2026 | | United Kingdom | September 1969 | 80, Fenchurch Street, London, EC3M 4BY, United Kingdom |
| MANKU, Pritpal ACTIVE | Director | 29 Oct 2025 | | United Kingdom | August 1971 | 80, Fenchurch Street, London, EC3M 4BY, United Kingdom |
| BONNAR, Anthony David RESIGNED | Secretary | 18 Jan 2006 | 21 Nov 2007 | | | Garden Flat, 1 Highbury Hill, London, N5 1SU |
| CHESSHER, Stephen George RESIGNED | Secretary | 08 Apr 2022 | 20 Jan 2025 | | | 80, Fenchurch Street, London, EC3M 4BY, United Kingdom |
| DAY, Margot Annabel RESIGNED | Secretary | 01 Nov 2018 | 15 Jun 2019 | | | Arcadis House 34 York Way, London, N1 9AB, England |
| LAWRENCE, Jillian Louise RESIGNED | Secretary | 01 Jan 2020 | 08 Apr 2022 | | | 80, Fenchurch Street, London, EC3M 4BY, United Kingdom |
| SMITH, Andrew Peter RESIGNED | Secretary | 22 Nov 2007 | 11 Jan 2013 | | | Echq, 34 York Way, London, N1 9AB, United Kingdom |
| ARCADIS EUROPE BV RESIGNED | Secretary | 20 Dec 2005 | 19 Jan 2006 | | | Nieuwe Stationsstraat 10, 6811 Ks, PO BOX 33, 6800 Le Arnhem, The Netherlands |
| TRUSEC LIMITED RESIGNED | Nominee Secretary | 28 Oct 2005 | 20 Dec 2005 | | | 2 Lambs Passage, London, EC1Y 8BB |
| ALGHITA, Mahmoud Bakir Ahmad RESIGNED | Director | 30 Sep 2021 | 30 Jun 2024 | England | March 1963 | 80, Fenchurch Street, London, EC3M 4BY, United Kingdom |
| BELLEW, Nicholas James RESIGNED | Director | 12 Aug 2019 | 10 Aug 2022 | Wales | March 1979 | 80, Fenchurch Street, London, EC3M 4BY, United Kingdom |
| BIMPSON, Simon Timothy RESIGNED | Director | 30 Sep 2021 | 01 Dec 2022 | United Kingdom | September 1974 | 80, Fenchurch Street, London, EC3M 4BY, United Kingdom |
| BIMPSON, Simon Timothy RESIGNED | Director | 30 Sep 2021 | 01 Feb 2026 | United Kingdom | September 1974 | 80, Fenchurch Street, London, EC3M 4BY, United Kingdom |
| BONNAR, Anthony David RESIGNED | Director | 18 Jan 2006 | 15 Jan 2008 | | December 1953 | Garden Flat, 1 Highbury Hill, London, N5 1SU |
| BROMHEAD, Steven James RESIGNED | Director | 01 Nov 2018 | 18 Oct 2021 | England | December 1972 | 80, Fenchurch Street, London, EC3M 4BY, United Kingdom |
| BROOKES, Alan Geoffrey RESIGNED | Director | 11 Jan 2013 | 10 Aug 2022 | England | November 1961 | 80, Fenchurch Street, London, EC3M 4BY, United Kingdom |
| BROOKS, Keith Lawrence RESIGNED | Director | 11 Jan 2013 | 29 Feb 2016 | England | January 1966 | Arcadis House, 34 York Way, London, N1 9AB, England |
| BROWN, Gavin Paul RESIGNED | Director | 13 Dec 2005 | 20 Dec 2005 | | September 1970 | 8 Wyatt Road, London, N5 2JJ |
| CARROLL, Michael Dennis RESIGNED | Director | 21 Jul 2011 | 13 Dec 2011 | United Kingdom | August 1953 | 10 Furnival Street, London, EC4A 1YH |
| CASH, Stewart RESIGNED | Director | 07 Jun 2024 | 29 Oct 2025 | United Kingdom | January 1973 | 80, Fenchurch Street, London, EC3M 4BY, United Kingdom |
| CLARK, Anne Rosemary RESIGNED | Director | 23 May 2017 | 12 Aug 2019 | England | December 1964 | Arcadis House 34 York Way, London, N1 9AB, England |
| COWLARD, Mark Allan RESIGNED | Director | 21 Mar 2018 | 10 Aug 2022 | England | June 1969 | 80, Fenchurch Street, London, EC3M 4BY, United Kingdom |
| HARRISON, Neil RESIGNED | Director | 13 Dec 2005 | 20 Dec 2005 | | June 1975 | 14 Glassworks Studios, Basing Place, London, E2 8AB |
| HOTTENHUIS, Stephanie RESIGNED | Director | 23 Jul 2012 | 01 Jan 2015 | The Netherlands | March 1965 | Echq, 34 York Way, London, N1 9AB, United Kingdom |
| MADDEN, Peter Vincent RESIGNED | Director | 01 Jul 2015 | 18 Oct 2021 | England | July 1961 | 80, Fenchurch Street, London, EC3M 4BY, United Kingdom |
| MCARTHUR, Neil Craig RESIGNED | Director | 12 Dec 2011 | 23 Jul 2012 | The Netherlands | September 1961 | 10 Furnival Street, London, EC4A 1YH |
| MONIR, Nicole Frances RESIGNED | Director | 28 Oct 2005 | 13 Dec 2005 | United Kingdom | May 1967 | 92 Crosslands, Caddington, Luton, Bedfordshire, LU1 4ER |
| MORGAN, Thomas Trevor RESIGNED | Director | 30 Sep 2021 | 30 Jun 2024 | United Kingdom | January 1975 | 80, Fenchurch Street, London, EC3M 4BY, United Kingdom |
| RITTER, Stephan Karl Heinz RESIGNED | Director | 01 Jan 2015 | 11 Apr 2017 | Germany | June 1968 | Arcadis House, 34 York Way, London, N1 9AB, England |
| SMITH, Andrew Peter RESIGNED | Director | 20 Mar 2008 | 13 Dec 2011 | England | March 1969 | 10 Furnival Street, London, EC4A 1YH |
| STOKER, Louise Jane RESIGNED | Director | 28 Oct 2005 | 13 Dec 2005 | | September 1973 | 2nd Floor Flat, 45 Hillfield Road, West Hampstead, London, NW6 1QD |
| VINCE, Peter John RESIGNED | Director | 20 May 2009 | 31 Jul 2011 | United Kingdom | May 1958 | 10 Furnival Street, London, EC4A 1YH |
| VREE, Renier RESIGNED | Director | 12 Dec 2011 | 11 Apr 2017 | The Netherlands | July 1964 | Arcadis House, 34 York Way, London, N1 9AB, England |
| WHITTAKER, Sian RESIGNED | Director | 01 Dec 2022 | 06 Sep 2024 | United Kingdom | February 1981 | 80, Fenchurch Street, London, EC3M 4BY, United Kingdom |
| WILLIAMS, Jennifer Ann RESIGNED | Director | 06 Sep 2024 | 01 Oct 2026 | England | July 1969 | 80, Fenchurch Street, London, EC3M 4BY, United Kingdom |
| YOUELL, Philip Anthony RESIGNED | Director | 11 Jan 2013 | 01 Jan 2015 | England | December 1960 | Echq, 34 York Way, London, N1 9AB, United Kingdom |
| ARCADIS N.V. RESIGNED | Director | 20 Dec 2005 | 11 Apr 2017 | | | Symphony, Gustav Mahlerplein 97-103, 1082 Ms, Amsterdam, Netherlands |