| HARRIS, James Huw Keir ACTIVE | Director | 30 Jun 2019 | | England | June 1968 | 10, Fleet Place, London, EC4M 7RB, United Kingdom |
| TRAVERS, Catherine Helen ACTIVE | Director | 01 Aug 2022 | | England | October 1964 | 10, Fleet Place, London, EC4M 7RB, United Kingdom |
| DESSON, William Gregor RESIGNED | Secretary | 01 Dec 1994 | 15 Mar 1996 | | | Torridon, Linersh Wood Bramley, Guildford, Surrey, GU5 0EF |
| FIELD, Joanna Maria RESIGNED | Secretary | 27 Jan 2015 | 31 Mar 2017 | | | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| FOX, Robin Bretten RESIGNED | Secretary | | 09 May 1994 | | | 6 Church Street, Little Shelford, Cambridge, Cambridgeshire, CB2 5HG |
| GREGORY, Philip Charles RESIGNED | Secretary | 15 Mar 1996 | 18 Feb 1998 | | | Mulberry House, 26 North Grove Highgate, London, N6 4SL |
| GRIGOR, Martin James RESIGNED | Secretary | 22 Oct 1993 | 01 Dec 1994 | | | 7 Cherry Tree Avenue, Stapleford, Cambridge, Cambridgeshire, CB2 5BW |
| LYNN, Marjorie Eva RESIGNED | Secretary | 18 Feb 1998 | 27 Jan 2015 | | | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| BIRCH, Richard Paul, Mr. RESIGNED | Director | 09 Apr 1998 | 31 Dec 2010 | United Kingdom | September 1948 | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| BLACKBURN, Michael Orlando RESIGNED | Director | 27 Jan 2004 | 18 Oct 2007 | | October 1945 | 7 More Close, Purley, Surrey, CR8 2JN |
| BROCK, David Andrew Abercromby RESIGNED | Director | 24 Jan 2011 | 30 Apr 2023 | United Kingdom | January 1962 | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| BROOKS, Marian Michele RESIGNED | Director | 30 Sep 2003 | 31 Oct 2012 | England | April 1954 | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| COX, David John RESIGNED | Director | 24 Jan 2011 | 19 Sep 2023 | United Kingdom | January 1961 | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| CUMMING, Christopher Edward, Dr RESIGNED | Director | | 31 Jan 2002 | United Kingdom | February 1942 | 32, Angle End, Great Wilbraham, Cambridge, Cambridgeshire, CB21 5JG, United Kingdom |
| FINNEY, Christopher Edmund RESIGNED | Director | | 20 Mar 2001 | | February 1941 | Silver Savory Smith, 15/17 Castle Street, Cambridge, CB3 0AH |
| FOREMAN, Derek Reginald RESIGNED | Director | 27 Jan 2004 | 17 Jan 2006 | | July 1944 | 146 Borstal Road, Rochester, Kent, ME1 3BB |
| FOX, Robin Bretten RESIGNED | Director | | 10 May 2002 | | November 1943 | 6 Church Street, Little Shelford, Cambridge, Cambridgeshire, CB2 5HG |
| FOX, Robin Bretten RESIGNED | Director | | 22 Oct 1993 | | November 1943 | 6 Church Street, Little Shelford, Cambridge, Cambridgeshire, CB2 5HG |
| FRAME, Martin Stevenson Crosbie RESIGNED | Director | 02 Jul 2002 | 29 Apr 2005 | England | April 1945 | 23 St Jamess Gardens, Holland Park, London, W11 4RE |
| HAIGH, Michael David RESIGNED | Director | 27 Nov 2015 | 31 Jul 2022 | United Kingdom | June 1960 | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| HOWELLS, Keith John, Mr. RESIGNED | Director | 09 Apr 1998 | 30 Jun 2019 | England | June 1953 | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| JACKSON, Brian Kenneth RESIGNED | Director | 01 Dec 1994 | 13 Mar 1998 | | March 1938 | 3 Bensteads End, Angle End Great Wilbraham, Cambridge, Cambridgeshire, CB1 5JS |
| LEE, Peter Stuart RESIGNED | Director | 01 Oct 1993 | 01 Dec 1994 | | January 1945 | Grove House 8 Newmarket Road, Stretham, Cambridge, Cambridgeshire, CB6 3JZ |
| MARTIN, John Leslie RESIGNED | Director | 03 Oct 2002 | 20 Sep 2019 | United Kingdom | October 1952 | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| MCDONNELL, Vincent Robert RESIGNED | Director | 03 Oct 2002 | 29 Aug 2003 | England | July 1951 | 33 Cambridge Avenue, New Malden, Surrey, KT3 4LD |
| 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 |
| WICKENS, Peter John RESIGNED | Director | 29 Jul 2005 | 31 Dec 2010 | England | January 1950 | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |