| RISDON, Richard, Mr. ACTIVE | Director | 07 Sep 2026 | | United Kingdom | October 1974 | 10, Fleet Place, London, EC4M 7RB, United Kingdom |
| SYMONS, Charles Ralph, Mr. ACTIVE | Director | 07 Sep 2026 | | United Kingdom | February 1974 | 10, Fleet Place, London, EC4M 7RB, United Kingdom |
| FIELD, Joanna Maria RESIGNED | Secretary | 27 Jan 2015 | 31 Mar 2017 | | | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| GREGORY, Philip Charles RESIGNED | Secretary | 07 May 2002 | 09 Feb 2004 | | | Mulberry House, 26 North Grove Highgate, London, N6 4SL |
| LYNN, Marjorie Eva RESIGNED | Secretary | 09 Feb 2004 | 27 Jan 2015 | | | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| MAWLAW SECRETARIES LIMITED RESIGNED | Secretary | 03 Apr 2002 | 07 May 2002 | | | 20, Black Friars Lane, London, EC4V 6HD |
| ARNOLD, Kevin RESIGNED | Director | 07 May 2002 | 24 Oct 2003 | United Kingdom | October 1965 | The Old Post House, Bells Yew Green, Tunbridge Wells, Kent, TN3 9AR |
| BISHOP, Martin William RESIGNED | Director | 07 May 2002 | 31 Aug 2002 | | April 1947 | 67 Rivermead Court, London, SW6 3RZ |
| BLACKBURN, Michael Orlando RESIGNED | Director | 07 May 2002 | 18 Oct 2007 | | October 1945 | 7 More Close, Purley, Surrey, CR8 2JN |
| CHESWORTH, Peter Michael RESIGNED | Director | 07 May 2002 | 05 Aug 2005 | | June 1945 | The Barn Shepreth Road, Barrington, Cambridge, CB2 5SB |
| FINLAYSON, Andrew Colin RESIGNED | Director | 03 Apr 2002 | 07 May 2002 | | October 1948 | 10 Gleneagles Drive, Tytherington, Macclesfield, Cheshire, SK10 2TG |
| GALBRAITH, Ian Martin Richard RESIGNED | Director | 31 Dec 2020 | 30 Sep 2025 | England | July 1963 | 10, Fleet Place, London, EC4M 7RB, United Kingdom |
| HAIGH, Michael David RESIGNED | Director | 30 Jun 2019 | 31 Jul 2022 | United Kingdom | June 1960 | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| HOWELLS, Keith John, Mr. RESIGNED | Director | 17 Mar 2004 | 30 Jun 2019 | England | June 1953 | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| LEONARD, Guy William Ingledew RESIGNED | Director | 07 May 2002 | 31 Dec 2020 | England | November 1955 | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| ROUD, Edwin George RESIGNED | Director | 01 Oct 2025 | 07 Sep 2026 | United Kingdom | September 1963 | 10, Fleet Place, London, EC4M 7RB, United Kingdom |
| STOVELL, Kevin John RESIGNED | Director | 29 Jul 2005 | 27 Nov 2015 | United Kingdom | July 1952 | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| TRAVERS, Catherine Helen RESIGNED | Director | 01 Aug 2022 | 07 Sep 2026 | England | October 1964 | 10, Fleet Place, London, EC4M 7RB, United Kingdom |
| WICKENS, Peter John RESIGNED | Director | 29 Jul 2005 | 31 Dec 2010 | England | January 1950 | 25 Longmoore Street, London, SW1V 1JQ |
| WILLIAMS, Andrew Martin RESIGNED | Director | 17 Mar 2004 | 15 Sep 2009 | England | October 1960 | 8 Brook Road, Mountfitchet, Stansted, Essex, CM24 8BB |
| WILLIAMS, Andrew Martin RESIGNED | Director | 07 May 2002 | 30 Sep 2002 | | October 1960 | Belthorn House, Hill Green, Clavering, Saffron Walden, Essex, CB11 4QS |
| WILLIS, James Andrew RESIGNED | Director | 03 Apr 2002 | 07 May 2002 | United Kingdom | October 1957 | 44 Alric Avenue, New Malden, Surrey, KT3 4JN |