| INFRASTRUCTURE MANAGERS LIMITED ACTIVE | Secretary | 14 Apr 2008 | | | | 8th Floor, 6 Kean Street, London, WC2B 4AS, United Kingdom |
| BLACKBURN, Stuart James Alston ACTIVE | Director | 05 Feb 2026 | | England | January 1995 | C/O Foresight Group Llp, The Shard, 32 London Bridge Street, London, SE1 9SG, United Kingdom |
| BOND, Josh Callum ACTIVE | Director | 01 May 2024 | | United Kingdom | May 1991 | Infrastructure Managers Limited, 2nd Floor Drum Suite, Saltire Court, 20 Castle Terrace, Edinburgh, EH1 2EN, United Kingdom |
| DIX, Carl Harvey ACTIVE | Director | 30 Jan 2023 | | United Kingdom | January 1966 | C/O Infrastructure Managers Limited, 2nd Floor Drum Suite, Saltire Court, 20 Castle Terrace, Edinburgh, EH1 2EN, United Kingdom |
| MCKENNA, Anthony ACTIVE | Director | 01 Apr 2023 | | United Kingdom | June 1965 | Veolia Water Outsourcing Limited, 1 Masterton Park, South Castle Drive, Dunfermline, KY11 8NX, United Kingdom |
| THAKRAR, Amit Rishi Jaysukh ACTIVE | Director | 24 Feb 2022 | | United Kingdom | July 1987 | 3rd Floor South Building, 200 Aldersgate Street, London, EC1A 4HD, United Kingdom |
| FOX, Jacqueline Elizabeth RESIGNED | Secretary | 14 Jun 2001 | 14 Jun 2001 | | | Little Dormers, 3 Wicken Road, Newport, Essex, CB11 3QD |
| MORRISON, John RESIGNED | Secretary | 04 Sep 1998 | 08 Oct 1999 | | | Willis Mar,13 Glen Brae, Falkirk, FK1 5LH |
| MACROBERTS (SOLICITORS) RESIGNED | Secretary | 08 Oct 1999 | 14 Apr 2008 | | | 152 Bath Street, Glasgow, G2 4TB |
| MACROBERTS (SOLICITORS) RESIGNED | Secretary | 08 Jun 1998 | 04 Sep 1998 | | | 152 Bath Street, Glasgow, G2 4TB |
| ACUTT, Bryan Michael RESIGNED | Director | 26 Sep 2016 | 01 May 2024 | United Kingdom | October 1979 | 16, Palace Street, London, SW1E 5JD, United Kingdom |
| BAL, Jasvinder Singh RESIGNED | Director | 21 Jan 2011 | 31 Mar 2014 | United Kingdom | January 1979 | 2nd, Floor, 11 Thistle Street, Edinburgh, EH2 1DF, United Kingdom |
| BARNES, John Anthony RESIGNED | Director | 02 May 2008 | 18 Aug 2008 | United Kingdom | September 1954 | Greenbank Farm, Smallwood, Cheshire, CW11 2UN |
| BATES, Duncan John Lucas RESIGNED | Director | 09 Nov 2010 | 23 Dec 2010 | England | August 1958 | C/O Infrastructure Managers Ltd, 2nd Floor, 11 Thistle Street, Edinburgh, EH2 1DF |
| BELL, Leslie Anthony RESIGNED | Director | 15 May 2009 | 09 Nov 2010 | United Kingdom | April 1950 | 25, Cambridge Road, Southport, Merseyside, PR9 9NQ |
| BELL, Leslie Anthony RESIGNED | Director | 01 Nov 2001 | 21 Oct 2003 | United Kingdom | April 1950 | 25 Cambridge Road, Southport, Merseyside, PR9 9NQ |
| BROOK, Christopher John RESIGNED | Director | 29 Jun 2007 | 09 Apr 2008 | | August 1959 | 12 Churchfields, Ashton On Mersey, Sale, Cheshire, M33 5NS |
| CAVILL, John Ivor RESIGNED | Director | 01 Nov 2013 | 01 May 2024 | United Kingdom | October 1972 | C/O Infrastructure Managers Limited, 2nd Floor Drum Suite, Saltire Court, 20 Castle Terrace, Edinburgh, EH1 2EN, United Kingdom |
| CLARK, Gordon Ross RESIGNED | Director | 16 Aug 2019 | 31 Mar 2023 | United Kingdom | February 1963 | Veolia Water Outsourcing Limited, 1 Masterton Park, South Castle Drive, Dunfermline, KY11 6HL, United Kingdom |
| CLARK, Jonathan RESIGNED | Director | 21 Oct 2003 | 14 Sep 2006 | | July 1954 | 9 St Catherine's Close, Bath, BA2 6BS |
| CLARK, Jonathan RESIGNED | Director | 04 Nov 1999 | 21 Oct 2003 | | July 1954 | 9 St Catherine's Close, Bath, BA2 6BS |
| COWAN, Andrew David RESIGNED | Director | 31 Oct 2010 | 09 Nov 2010 | Uk/England | October 1966 | Haweswater House, Lingley Green Avenue, Lingley Mere Business Park, Great Sankey, Warrington, WA5 3LP, United Kingdom |
| CURRY, Philip RESIGNED | Director | 25 Nov 1998 | 16 Jun 1999 | | July 1950 | The Old Maltings, Arkesden, Essex, CB11 4HB |
| DEATLEY, Steven Frank RESIGNED | Director | 16 Jun 1999 | 04 Nov 1999 | | July 1961 | New Zealand House, 10th Floor, 80 Haymarket, London, SW1Y 4TE |
| DERBY, Scott Campbell RESIGNED | Director | 21 Oct 2003 | 30 Jun 2004 | | April 1967 | 30 Elm Grove Road, London, SW13 0BT |
| EDWARDS, Michael John RESIGNED | Director | 29 Aug 2008 | 15 May 2009 | United Kingdom | April 1955 | 18 Oakwood Lane, Bowden, Altrincham, Cheshire, WA14 3DL |
| FULLER, David Leonard RESIGNED | Director | 02 May 2008 | 18 Aug 2008 | | January 1960 | 5 Drumble Field, Chelford, Cheshire, SK11 9BT |
| FULLER, David Leonard RESIGNED | Director | 14 Sep 2006 | 12 Apr 2007 | | January 1960 | 5 Drumble Field, Chelford, Cheshire, SK11 9BT |
| FULLERTON, Robert Souter RESIGNED | Director | 01 Aug 2000 | 13 Sep 2002 | Scotland | December 1952 | 26 Quarry Avenue, Cambuslang, Glasgow, G72 8UF |
| GILMOUR, David Fulton RESIGNED | Director | 27 Jul 2012 | 26 Nov 2021 | United Kingdom | January 1963 | 2nd, Floor, 11 Thistle Street, Edinburgh, EH2 1DF |
| HARDY, David Michael RESIGNED | Director | 01 Apr 2014 | 14 Feb 2018 | England | December 1957 | John Laing Plc, 1 Kingsway, London, WC2B 6AN, United Kingdom |
| HOPE, John Alexander RESIGNED | Director | 01 Aug 2000 | 11 Dec 2000 | United Kingdom | January 1957 | Eildon, 17 Craigielaw Park, Aberlady, Longniddry, East Lothian, EH32 0PR |
| JACK, Ronald Gilfillan RESIGNED | Director | 13 Dec 2007 | 18 Sep 2009 | Scotland | December 1955 | 78 Avalon Gardens, Linlithgow, West Lothian, EH49 7PL |
| JAFFE, Michael Ian RESIGNED | Director | 12 Apr 2010 | 31 Mar 2014 | United Kingdom | September 1964 | 2nd, Floor, 11 Thistle Street, Edinburgh, EH2 1DF, United Kingdom |
| JEANTET, Patrick Raymond RESIGNED | Director | 22 Mar 2001 | 30 Jun 2004 | France | April 1960 | 9 Rue Eugene Millon, 75015, Paris, FOREIGN, France |
| JONES, Nigel Stuart RESIGNED | Director | 30 Jun 2004 | 29 Jun 2007 | | January 1954 | 3 Osprey Court, Star Place, London, E1W 1AG |
| KEEGAN, Graham Robinson RESIGNED | Director | 15 May 2009 | 31 Oct 2010 | United Kingdom | June 1958 | 1 Holly Close, Mickle Trafford, Chester, CH2 4QY |
| KILGOUR, David John RESIGNED | Director | 16 Jun 2000 | 06 Mar 2008 | England | March 1961 | 2, Dean Drive, Bowden, Cheshire, WA14 3NE |
| KYLE, Roy RESIGNED | Director | 28 Feb 2023 | 05 Feb 2026 | England | February 1961 | C/O Foresight Group Llp, The Shard, 32 London Bridge Street, London, SE1 9SG, United Kingdom |
| MALONEY, Colin Philip RESIGNED | Director | 29 Aug 2008 | 15 May 2009 | United Kingdom | April 1958 | Brook Farm House, Hall Lane - Mawdesley, Ormskirk, Lancashire, L40 2QY |
| MARTIN, Joseph Michael RESIGNED | Director | 25 Nov 1998 | 01 Aug 2000 | | December 1952 | 8 Mill View School Lane, Eaton Socon, St Neots, Cambridgeshire, PE19 3HJ |
| MAWDSLEY, Alan Dean RESIGNED | Director | 04 Sep 1998 | 16 Jun 1999 | | September 1957 | 6 Nepean Street, London, SW15 5DW |
| MCDONAGH, Vicky RESIGNED | Director | 17 Mar 2004 | 18 Sep 2007 | | October 1968 | 59 Sarsfeld Road, London, SW12 8HR |
| MCFADZEAN, John Findlay RESIGNED | Director | 28 Aug 2009 | 01 Nov 2013 | Scotland | August 1948 | Wester Nether, Urquhart House, Strathmiglo, Cupar, Fife, KY14 7RR, United Kingdom |
| MCFADZEAN, John Findlay RESIGNED | Director | 11 Dec 2000 | 17 Mar 2004 | Scotland | August 1948 | Wester Nether Urquhart House, Strathmiglo, Cupar, Fife, KY14 7RR |
| MCFADZEAN, John Findlay RESIGNED | Director | 04 Sep 1998 | 01 Aug 2000 | Scotland | August 1948 | Wester Nether Urquhart House, Strathmiglo, Cupar, Fife, KY14 7RR |
| MIDDLETON, Nigel Wythen RESIGNED | Director | 14 Oct 2009 | 18 Feb 2013 | United Kingdom | November 1956 | Barclays Bank Plc, 1 Churchill Place, London, E14 5HP |
| PATERSON, Nigel John RESIGNED | Director | 05 May 2015 | 16 Aug 2019 | England | October 1957 | 210, Pentonville Road, London, N1 9JY, United Kingdom |
| PIGACHE, Guy Roland Marc RESIGNED | Director | 17 Mar 2004 | 21 Jan 2011 | United Kingdom | November 1960 | 30 Earls Road, Tunbridge Wells, Kent, TN4 8EE |
| PROCTOR, Steven RESIGNED | Director | 13 Dec 2007 | 12 Apr 2010 | England | November 1968 | 19 Amner Road, London, SW11 6AA |
| QUINT, Didier Paul-Louis RESIGNED | Director | 16 Jun 1999 | 22 Mar 2001 | | May 1945 | The Cottage Woodford, Les Gravees, St Peter Port, GY1 1RL, Guernsey |
| RITCHIE, Alan Campbell RESIGNED | Director | 13 Mar 2009 | 14 Oct 2009 | United Kingdom | April 1967 | 57 Kettilstoun Mains, Linlithgow, West Lothian, EH49 6SH |
| SAUNDERS, Malcolm Richard RESIGNED | Director | 09 Nov 2010 | 05 May 2015 | England | November 1958 | 2nd, Floor, 11 Thistle Street, Edinburgh, EH2 1DF, United Kingdom |
| SCOTT-BARRETT, Nicholas Huson RESIGNED | Director | 30 Jun 2004 | 22 Dec 2008 | | July 1950 | Gatehouse Farm, Crown Lane, Ardleigh, Colchester, CO7 7QZ |
| SMITH, Michael Robert RESIGNED | Director | 13 Sep 2002 | 17 Mar 2004 | | December 1949 | The Schoolhouse, Daviot, Inverurie, Aberdeenshire, AB51 0HZ |
| TANNER, Christopher James RESIGNED | Director | 01 Apr 2014 | 28 Feb 2023 | England | November 1972 | John Laing Plc, 1 Kingsway, London, WC2B 6AN, United Kingdom |
| TREGASKIS, Gordon Joseph Martin RESIGNED | Director | 04 Sep 1998 | 16 Jun 2000 | | February 1955 | 82-62 The Noble, Sukhumvit Soi 63 Sub Soi, 10110, Bangkok |
| WATERS, Gordon Arthur Ivan RESIGNED | Director | 25 Nov 1998 | 01 Nov 2001 | | June 1947 | 10 Corbett Avenue, Droitwich, Worcestershire, WR9 7BE |
| WRIGHT, Matthew Reginald RESIGNED | Director | 12 Apr 2007 | 13 May 2008 | | January 1965 | Flat 2, 39 Hamilton Street, Chester, CH2 3JQ |
| WRINN, John RESIGNED | Director | 26 Nov 2021 | 30 Jan 2023 | United Kingdom | August 1962 | Infrastructure Managers Limited, 2nd Floor, 11 Thistle Street, Edinburgh, EH2 1DF, United Kingdom |
| BIIF CORPORATE SERVICES LIMITED RESIGNED | Director | 28 Feb 2013 | 26 Sep 2016 | | | Cannon Place, 78 Cannon Street, London, EC4N 6AF, United Kingdom |
| MACROBERTS CORPORATE SERVICES LIMITED RESIGNED | Director | 08 Jun 1998 | 04 Sep 1998 | | | 152 Bath Street, Glasgow, G2 4TB, Scotland |