| 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 |
| BISHOP, Kevin Robert RESIGNED | Secretary | 01 May 2007 | 02 Dec 2009 | | | 15a West Hatch Manor, Ruislip, Middlesex, HA4 8QX |
| FIELD, Joanna Maria RESIGNED | Secretary | 27 Jan 2015 | 31 Mar 2017 | | | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| LYNN, Marjorie Eva RESIGNED | Secretary | 02 Dec 2009 | 27 Jan 2015 | | | Mott Macdonald House 8-10, Sydenham Road, Croydon, Surrey, CR0 2EE |
| MARK, Brian Stephen RESIGNED | Secretary | 10 Jul 1997 | 01 May 2007 | | | 10 Palmers Crescent, Kingston Upon Thames, Surrey, KT1 3AP |
| SWIFT INCORPORATIONS LIMITED RESIGNED | Nominee Secretary | 10 Jul 1997 | 10 Jul 1997 | | | 26, Church Street, London, NW8 8EP |
| BUCKLEY, Christopher John RESIGNED | Director | 01 May 2007 | 02 Dec 2009 | | June 1961 | 85 Newbridge Hill, Bath, Somerset, BA1 3PT |
| DIXON, Kevin Paul RESIGNED | Director | 02 Dec 2009 | 27 Nov 2015 | United Kingdom | June 1953 | Mott Macdonald House 8-10, Sydenham Road, Croydon, Surrey, CR0 2EE |
| FORD, Andrew John RESIGNED | Director | 10 Jul 1997 | 02 Dec 2009 | England | July 1953 | 89 Connaught Road, Teddington, Middlesex, TW11 0QQ |
| GALBRAITH, Ian Martin Richard RESIGNED | Director | 31 Dec 2020 | 30 Sep 2025 | England | July 1963 | 10, Fleet Place, London, EC4M 7RB, United Kingdom |
| HAIGH, Mchael David RESIGNED | Director | 31 Mar 2015 | 31 Jul 2022 | England | June 1960 | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| HARRIS, James Huw Keir RESIGNED | Director | 30 Jun 2019 | 07 Sep 2026 | England | June 1968 | 10, Fleet Place, London, EC4M 7RB, United Kingdom |
| HOWELLS, Keith John, Mr. RESIGNED | Director | 02 Dec 2009 | 30 Jun 2019 | England | June 1953 | Mott Macdonald House 8-10, Sydenham Road, Croydon, Surrey, CR0 2EE |
| LEONARD, Guy William Ingledew, Mr. RESIGNED | Director | 02 Dec 2009 | 31 Dec 2020 | England | November 1955 | Mott Macdonald House 8-10, Sydenham Road, Croydon, Surrey, CR0 2EE |
| MARK, Brian Stephen RESIGNED | Director | 10 Jul 1997 | 02 Dec 2009 | | October 1955 | 10 Palmers Crescent, Kingston Upon Thames, Surrey, KT1 3AP |
| MARK, Peter John RESIGNED | Director | 08 Oct 2002 | 02 Dec 2009 | England | May 1958 | 81 Deerings Road, Reigate, Surrey, RH2 0PT |
| MUHSINOVIC, Saud RESIGNED | Director | 01 May 2007 | 02 Dec 2009 | | January 1970 | 63c Elsham Road, London, W14 8HD |
| NISSEN, Peter Bryan RESIGNED | Director | 01 May 2007 | 02 Dec 2009 | England | December 1970 | 41 Champion Road, Upminster, Essex, RM14 2SZ |
| ROUD, Edwin George RESIGNED | Director | 31 Mar 2015 | 07 Sep 2026 | United Kingdom | September 1963 | 10, Fleet Place, London, EC4M 7RB, United Kingdom |
| SHENNAN, Richard John RESIGNED | Director | 10 Jul 1997 | 02 Dec 2009 | United Kingdom | August 1955 | 23, Corinne Road, London, N19 5EZ |
| STOVELL, Kevin John RESIGNED | Director | 02 Dec 2009 | 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 | 02 Dec 2009 | 31 Dec 2010 | England | January 1950 | Mott Macdonald House 8-10, Sydenham Road, Croydon, Surrey, CR0 2EE |
| WILDFIRE, Clare Elizabeth RESIGNED | Director | 01 May 2007 | 02 Dec 2009 | | June 1964 | 30 High Street, Horsell, Woking, Surrey, GU21 4UD |
| WILLIAMS, Richard RESIGNED | Director | 02 Dec 2009 | 31 Mar 2015 | England | February 1955 | Mott Macdonald House 8-10, Sydenham Road, Croydon, Surrey, CR0 2EE |