| HARRIS, James Huw Keir ACTIVE | Director | 23 Jan 2017 | | England | June 1968 | 31st Floor, 40 Bank Street, London, E14 5NR |
| TRAVERS, Catherine Helen ACTIVE | Director | 01 Nov 2019 | | England | October 1964 | 31st Floor, 40 Bank Street, London, E14 5NR |
| DESSON, William Gregor RESIGNED | Secretary | 01 Dec 1994 | 15 Mar 1996 | | | Torridon, Linersh Wood Bramley, Guildford, Surrey, GU5 0EF |
| DEWEY, Stephanie Mary RESIGNED | Secretary | 17 Aug 1993 | 01 Dec 1994 | | | 24 Station Road, Preston Park, Brighton, East Sussex, BN1 6SF |
| 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 | 15 Mar 1996 | 10 Oct 1997 | | | Mulberry House, 26 North Grove Highgate, London, N6 4SL |
| LYNN, Marjorie Eva RESIGNED | Secretary | 10 Oct 1997 | 27 Jan 2015 | | | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| NICHOL, Hamish Bruce RESIGNED | Secretary | 01 Mar 1993 | 17 Aug 1993 | | | Broomfield 12 Tongdean Road, Hove, East Sussex, BN3 6QR |
| WILLOX, Henry Steven RESIGNED | Secretary | | 01 Mar 1993 | | | Shelbourne Cuckmere Road, Seaford, East Sussex, BN25 4DG |
| BLACK, Peter RESIGNED | Director | 15 Jul 2011 | 22 Feb 2017 | United Kingdom | December 1951 | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| BLACKBURN, Michael Orlando RESIGNED | Director | 10 Oct 1997 | 29 Oct 2003 | | October 1945 | 7 More Close, Purley, Surrey, CR8 2JN |
| CARDEN, Peter James, Mr. RESIGNED | Director | 23 Jan 2017 | 01 Jul 2020 | England | August 1958 | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| DEPOLLAS, Herrikos Emmanuel RESIGNED | Director | 19 Aug 2002 | 20 Oct 2014 | England | April 1951 | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| DEWEY, Stephanie Mary RESIGNED | Director | 01 Feb 1993 | 01 Dec 1994 | | December 1953 | 24 Station Road, Preston Park, Brighton, East Sussex, BN1 6SF |
| FOX, Robin Bretten RESIGNED | Director | 20 Aug 1995 | 13 Oct 1997 | | November 1943 | 6 Church Street, Little Shelford, Cambridge, Cambridgeshire, CB2 5HG |
| GRUNDY, Michael James RESIGNED | Director | 20 Oct 2014 | 31 Dec 2015 | England | February 1954 | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE, United Kingdom |
| HAIGH, Michael David RESIGNED | Director | 23 Jan 2017 | 01 Nov 2019 | United Kingdom | June 1960 | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| HORNSBY, Martin Robert RESIGNED | Director | 05 May 2000 | 15 Jul 2011 | United Kingdom | September 1951 | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| HOWELLS, Keith John, Mr. RESIGNED | Director | 25 Mar 2003 | 23 Jan 2017 | England | June 1953 | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| LAW, Richard Angus RESIGNED | Director | | 17 Jun 1992 | | May 1944 | 45 Gander Hill, Haywards Heath, West Sussex, RH16 1RE |
| MAYO, Bruce RESIGNED | Director | 30 Jun 1994 | 03 May 2002 | England | May 1942 | 1 The Paddock, Shoreham By Sea, West Sussex, BN43 5NW |
| NICHOL, Hamish Bruce RESIGNED | Director | 17 Jun 1992 | 30 Jun 1994 | | April 1945 | Broomfield 12 Tongdean Road, Hove, East Sussex, BN3 6QR |
| PALMER, David Ernest RESIGNED | Director | 01 Dec 1994 | 20 Aug 1995 | | August 1935 | Nordwic, Woodlands Road, Bickley, Kent, BR1 2AR |
| SELBY, Michael John RESIGNED | Director | | 01 Feb 1993 | | May 1944 | 20 Pinehurst, Burgess Hill, West Sussex, RH15 0DQ |
| SPEARING, Christopher Michael, Mr. RESIGNED | Director | 25 Apr 2016 | 23 Jan 2017 | England | October 1955 | Mott Macdonald House, 8-10 Sydenham Road, Croydon, Surrey, CR0 2EE |
| STOVELL, Kevin John RESIGNED | Director | 20 Aug 1995 | 14 Apr 2000 | United Kingdom | July 1952 | 6 Spencer Road, Twickenham, Middlesex, TW2 5TH |
| TILL, Bruce James Stanley RESIGNED | Director | 01 Feb 1993 | 01 Dec 1994 | | February 1966 | 36 Compton Road, Brighton, East Sussex, BN1 5AN |
| WILLOX, Henry Steven RESIGNED | Director | 30 Jun 1994 | 23 Jan 1996 | England | August 1950 | Shelbourne Cuckmere Road, Seaford, East Sussex, BN25 4DG |
| WILLOX, Henry Steven RESIGNED | Director | | 01 Feb 1993 | England | August 1950 | Shelbourne Cuckmere Road, Seaford, East Sussex, BN25 4DG |