| INFRASTRUCTURE MANAGERS LIMITED ACTIVE | Secretary | 18 Jul 2007 | | | | 8th Floor, 6 Kean Street, London, WC2B 4AS, United Kingdom |
| CAVILL, John Ivor ACTIVE | Director | 25 Jan 2016 | | England | October 1972 | 8th Floor, 6 Kean Street, London, WC2B 4AS, United Kingdom |
| DAKPOE, Prince Yao ACTIVE | Director | 01 Apr 2024 | | United Kingdom | December 1979 | Infrastructure Managers Limited, 2nd Floor Drum Suite, Saltire Court, 20 Castle Terrace, Edinburgh, EH1 2EN, United Kingdom |
| KNIGHT, Mark Jonathan ACTIVE | Director | 31 Jan 2023 | | United Kingdom | October 1974 | 8th Floor, 6 Kean Street, London, WC2B 4AS, United Kingdom |
| BESWICK, Nigel Lloyd RESIGNED | Secretary | 14 May 1998 | 29 Jan 2001 | | | 44 Brantwood Road, Herne Hill, London, SE24 0DJ |
| MCCARTHY, James RESIGNED | Secretary | 30 Jan 2001 | 10 Apr 2002 | | | 193 Weston Lane, Bulkington, Bedworth, Warwickshire, CV12 9RX |
| MCNAUGHT, William Wright RESIGNED | Secretary | 10 Apr 2002 | 18 Jul 2007 | | | 14 Church Road East, Farnborough, Hampshire, GU14 6QJ |
| SWIFT INCORPORATIONS LIMITED RESIGNED | Nominee Secretary | 14 May 1998 | 14 May 1998 | | | 26, Church Street, London, NW8 8EP |
| ARCHER JONES, Keith Edward RESIGNED | Director | 22 Feb 2006 | 02 Dec 2006 | | June 1954 | Turnpike Cottages, Heckfield, Hook, Hampshire, RG27 0LE |
| ASHBROOK, Philip Peter RESIGNED | Director | 25 Jul 2014 | 29 Jun 2018 | England | May 1960 | 2nd Floor, 11 Thistle Street, Edinburgh, EH2 1DF, United Kingdom |
| BALDOCK, Graham RESIGNED | Director | 24 Jun 2010 | 31 Mar 2020 | United Kingdom | May 1958 | Cannon Place, 78 Cannon Street, London, EC4N 6AF, United Kingdom |
| BARRAS, Florence Marie Francoise RESIGNED | Director | 24 Apr 2001 | 30 Jun 2002 | England | June 1964 | 14 Rydon Street, London, N1 7AL |
| BESWICK, Nigel Lloyd RESIGNED | Director | 19 Mar 1999 | 29 Jan 2001 | United Kingdom | September 1963 | 44 Brantwood Road, Herne Hill, London, SE24 0DJ |
| BUDD, Paul RESIGNED | Director | 07 Dec 2005 | 22 Feb 2006 | England | March 1963 | 48 Chestnut Close, Hockley, Essex, SS5 5EQ |
| BURDESS, Stuart RESIGNED | Director | 09 Dec 2003 | 05 Apr 2005 | England | September 1946 | Orchard House, 3 Manor House Drive, Ascot, Berkshire, SL5 7LL |
| CORNWELL, Anthony Bruce RESIGNED | Director | 14 May 1998 | 19 Mar 1999 | United Kingdom | February 1943 | The Cottage 134 London Road, Bagshot, Surrey, GU19 5BZ |
| CRAWSHAW, Andrew Julian RESIGNED | Director | 19 Mar 2008 | 24 Jun 2010 | England | October 1966 | Serco House, 16 Bartley Wood Business Park, Bartley Way, Hook, Hampshire, RG27 9UY |
| EWER, Adrian James Henry RESIGNED | Director | 14 May 1998 | 27 May 1998 | United Kingdom | September 1953 | Blagdens House Bumpstead Road, Hempstead, Saffron Walden, Essex, CB10 2PW |
| FUTCHER, William Frank RESIGNED | Director | 14 May 1998 | 30 Jun 2002 | | February 1947 | 1 Beech Park, Amersham, Buckinghamshire, HP6 6PY |
| HAGA, Thomas Justin RESIGNED | Director | 30 Sep 2011 | 01 Dec 2012 | United Kingdom | February 1976 | Northwest Wing, Bush House, Aldwych, London, WC2B 4EZ |
| HARRIS, Daren RESIGNED | Director | 05 Apr 2005 | 02 Dec 2006 | | December 1964 | Norfolk Cottage, New Mill Lane, Eversley, Hampshire, RG27 0RA |
| HILL, Gavin RESIGNED | Director | 19 Sep 2002 | 09 Dec 2003 | England | February 1968 | Pine Ridge House, 4 Bourne Grove Close Lower Bourne, Farnham, Surrey, GU10 3RA |
| HOILE, Richard David RESIGNED | Director | 01 Dec 2012 | 25 Jul 2014 | United Kingdom | December 1963 | Northwest Wing, Bush House, Aldwych, London, WC2B 4EZ |
| JONES, Peter Donne RESIGNED | Director | 02 Feb 2001 | 30 Sep 2005 | | March 1955 | The Red Barn, Mounton Road, Chepstow, Monmouthshire, NP16 6AA |
| JONES, Stuart Nigel RESIGNED | Director | 05 Aug 1999 | 25 Aug 2000 | | January 1954 | 48 Beacons Park, Brecon, Powys, LD3 9BR |
| MCCARTHY, James RESIGNED | Director | 30 Jan 2001 | 10 Apr 2002 | United Kingdom | May 1960 | 193 Weston Lane, Bulkington, Bedworth, Warwickshire, CV12 9RX |
| MCDONAGH, John RESIGNED | Director | 02 Dec 2006 | 19 Mar 2009 | | December 1969 | 30 St Botolph's Road, Sevenoaks, Kent, TN13 3AG |
| MCGHIE, David Watt RESIGNED | Director | 11 Feb 2003 | 08 Apr 2003 | | April 1953 | Old Post Cottage, Silchester Road, Little London, Hampshire, RG26 5ES |
| MCNAUGHT, William Wright RESIGNED | Director | 10 Apr 2002 | 19 Mar 2008 | | April 1945 | 14 Church Road East, Farnborough, Hampshire, GU14 6QJ |
| MEAD, Mark William RESIGNED | Director | 30 Sep 2005 | 02 Dec 2006 | United Kingdom | November 1964 | 28 The Burlings, Ascot, Berkshire, SL5 8BY |
| MIDDLETON, Nigel Wythen RESIGNED | Director | 19 Mar 2009 | 01 Dec 2012 | United Kingdom | November 1956 | Barclays Bank Plc, 1 Churchill Place, London, E14 5HP |
| NEVILLE, Gary Arthur RESIGNED | Director | 30 Jun 2002 | 30 Sep 2005 | England | August 1956 | Barn Cottage, Long Road West, Dedham, Essex, CO7 6EH |
| REICHERTER, Matthias Alexander RESIGNED | Director | 19 Mar 2009 | 30 Sep 2011 | United Kingdom | January 1970 | Barclays Bank Plc, 1 Churchill Place, London, E14 5HP |
| ROPER, Anthony Charles RESIGNED | Director | 27 May 1998 | 06 Jun 2001 | United Kingdom | December 1960 | Allington Grange, Allington, Chippenham, Wiltshire, SN14 6LW |
| RYAN, Michael Joseph RESIGNED | Director | 02 Dec 2006 | 19 Mar 2009 | United Kingdom | April 1966 | Apartment 42,, Central Building, 3 Matthew Parker Street, London, SW1H 9NE |
| SHELDRAKE, Peter John RESIGNED | Director | 29 Jun 2018 | 31 Jan 2023 | England | April 1959 | Cannon Place, 78 Cannon Street, London, EC4N 6AF, United Kingdom |
| SMITH, Neil RESIGNED | Director | 30 Jun 1998 | 05 Aug 1999 | England | April 1947 | 9 Hopkins Close, Milton Keynes Village, Milton Keynes, MK10 9AS |
| WHITMORE, Ian RESIGNED | Director | 14 May 1998 | 30 Jun 1998 | | January 1955 | The Willows 8 Landsborough Gate, Willen, Milton Keynes, Bucks, MK15 9JT |
| WHITMORE, Paul RESIGNED | Director | 27 May 1998 | 30 Jun 1998 | United Kingdom | January 1955 | The Willow, 8 Landsborough Gate Willen, Milton Keynes, Buckinghamshire, MK15 9GT |
| WHITTINGTON, John RESIGNED | Director | 25 Aug 2000 | 02 Feb 2001 | | March 1960 | 41 Harewood Avenue, Marylebone, London, NW1 6LE |
| BIIF CORPORATE SERVICES LIMITED RESIGNED | Director | 01 Dec 2012 | 25 Jan 2016 | | | Cannon Place, 78 Cannon Street, London, EC4N 6AF, United Kingdom |