| HALL STURT, Victoria ACTIVE | Secretary | 05 May 2004 | | | | Stantec House, Kelburn Court, Birchwood, Warrington, WA3 6UT, England |
| BANKS, Peter Hendry ACTIVE | Director | 03 Jun 2024 | | Scotland | December 1970 | Stantec House, Kelburn Court, Birchwood, Warrington, WA3 6UT, England |
| HALL-STURT, Victoria Jayne ACTIVE | Director | 30 Aug 2018 | | England | January 1973 | Stantec House, Kelburn Court, Birchwood, Warrington, WA3 6UT, England |
| SCHEFER, Catherine Margaret ACTIVE | Director | 04 Sep 2014 | | England | January 1968 | Stantec House, Kelburn Court, Birchwood, Warrington, WA3 6UT, England |
| COLLINGWOOD, Graham RESIGNED | Secretary | | 05 May 2004 | | | 19 Cedar Drive, Marlow, Buckinghamshire, SL7 3QB |
| MALONEY, Gina Paola RESIGNED | Secretary | 05 Nov 2012 | 03 Aug 2018 | | | Buckingham Court, Kingsmead Business Park, London Road, High Wycombe, Buckinghamshire, HP11 1JU, England |
| MOIST, Sarah Ann RESIGNED | Secretary | 31 Jul 2008 | 01 Dec 2016 | | | 65, Graham Street, Birmingham, West Midlands, B1 3JR |
| ABRAHAM, John Patrick RESIGNED | Director | 04 Apr 2012 | 17 Feb 2015 | England | March 1968 | Mwh, Gregge Street, Heywood, Lancashire, OL10 2DX, United Kingdom |
| AINGER, Charles Major RESIGNED | Director | | 11 Aug 1994 | | January 1943 | 16 Cumberland Close, Aylesbury, Buckinghamshire, HP21 7HH |
| BARNES, David Griffin RESIGNED | Director | 07 Jul 2016 | 18 Jul 2017 | Usa | July 1961 | 380, Interlocken Crescent, Suite 200, Broomfield, Colorado, 80021, Usa |
| BARRETT, Alan Dennis RESIGNED | Director | | 11 Aug 1994 | | August 1935 | 2 Grand Avenue, Hove, East Sussex, BN3 2LB |
| BICKNELL, Mark RESIGNED | Director | | 21 Oct 1993 | | April 1934 | The Bull Coach House 21 High Street, Nettlebed, Henley On Thames, Oxfordshire, RG9 5DA |
| BRIDLE, Rodney Charles RESIGNED | Director | | 11 Aug 1994 | United Kingdom | November 1942 | Dunford House Walnut Close, Great Missenden, Buckinghamshire, HP16 9AL |
| CARROLL, William J RESIGNED | Director | 11 Aug 1994 | 18 Aug 1999 | | November 1923 | 324w Starlight Crest Drive, Lacanada, California, 91011, Usa |
| COCHRANE, Johnnie L RESIGNED | Director | 11 Aug 1994 | 18 Aug 1999 | | October 1937 | 2373 N Hobart Boulevard, Los Angeles, California, 90027, Usa |
| COLE, Ronald Gordon RESIGNED | Director | | 31 Dec 2002 | | June 1940 | Monks Staithe, Church Lane, Princes Risborough, Buckinghamshire, HP27 9AW |
| COWELL, Andrew Richard RESIGNED | Director | 24 Sep 2009 | 05 Apr 2012 | England | April 1958 | 9, The Beechams, Mersley, Milton Keynes, Bucks, MK17 0RX |
| DROSSAERT, Wilhelmus Maria Eugene, Dr RESIGNED | Director | 06 Apr 2009 | 08 Jun 2015 | Netherlands | June 1967 | Buckingham Court, Kingsmead Business Park, London Road, High Wycombe, Buckinghamshire, HP11 1JU, England |
| EVENSON, Donald E RESIGNED | Director | 11 Aug 1994 | 18 Aug 1999 | | October 1938 | 17 Lurmann Court, Alamo, California, 94507, Usa |
| FARRER, Kenneth Arthur RESIGNED | Director | 18 Aug 1999 | 27 Apr 2006 | | July 1944 | 7a Kings Oak Close, Monks Risborough, Princes Risborough, Buckinghamshire, HP27 9LB |
| FOUNTAIN, Andrew William RESIGNED | Director | 01 Apr 2007 | 21 Sep 2009 | | September 1942 | 9 The Staddles, Little Hallingbury, Bishops Stortford, Hertfordshire, CM22 7SW |
| GARRIONE, Giampaolo RESIGNED | Director | 18 Aug 1999 | 05 May 2004 | | August 1942 | Via Degli Alerami 31, Milano, Lombardia, Italy |
| HALL, Philip Lynn RESIGNED | Director | 01 Jan 2002 | 30 Apr 2003 | | May 1942 | 1 Henley Close, Appleton, Warrington, WA4 5LY |
| HEINSO, Tiit RESIGNED | Director | 11 Aug 1994 | 23 Oct 1996 | | October 1938 | Hong Kong Parkview Tower 5 Suite 2137, 88 Tai Tam Reservoir Road, Hong Kong |
| HOLMGREN, Richard S RESIGNED | Director | 11 Aug 1994 | 18 Aug 1999 | | May 1928 | 12281 Arrow Point Loop, Baintree Island, Washington, 98110, Usa |
| HOWARD, Bruce Kenneth RESIGNED | Director | 05 May 2004 | 12 Apr 2007 | | October 1949 | 16 Whitson Close, High Legh, Knutsford, Cheshire, WA16 6UD |
| KRAUSE, Alan Joel RESIGNED | Director | 13 Oct 2010 | 04 Apr 2012 | Usa | February 1954 | 380, Interlocken Crescent, Broomfield, Colorado, 80021, Usa |
| KUIKEN, James Graham RESIGNED | Director | 04 Apr 2012 | 15 Jun 2016 | United States | December 1954 | 380, Interlocken Crescent, Suite 200, Broomfield, Colorado, 80021, Usa |
| MCAULAY, Ian James, Dr RESIGNED | Director | 27 Apr 2006 | 12 Apr 2007 | United Kingdom | April 1965 | 27 Westcliff Gardens, Appleton, Warrington, WA4 5FQ |
| MISCOLL, James P RESIGNED | Director | 11 Aug 1994 | 18 Aug 1999 | | August 1934 | 107 Bret Harte Road, San Rafael, California, 94901 52, Usa |
| NADARAJAH, Arumugam RESIGNED | Director | | 11 Aug 1994 | | January 1934 | 10a Kay Siang Road, 1024, FOREIGN, Singapore |
| NICKOLS, Adrian David RESIGNED | Director | 27 Apr 2006 | 24 Aug 2009 | England | April 1960 | The Crossways, 1 High Street, Dormansland, Surrey, RH7 6PU |
| NOBLE, Ian Andrew RESIGNED | Director | 13 Aug 2007 | 05 Apr 2012 | England | December 1957 | 13, Ryecroft Close, Woodley, Reading, Berkshire, RG5 3BP |
| OSWELL, Michael Andrew RESIGNED | Director | 18 Aug 1999 | 31 Dec 2000 | | December 1947 | Sandford Cottage Aston, Sandford, Aylesbury, Buckinghamshire, HP17 8LD |
| OSWELL, Michael Andrew RESIGNED | Director | | 11 Aug 1994 | | December 1947 | 120 Medallion Heights, 45 Conduit Street Mid-Levels, FOREIGN, Hong Kong |
| PIKE, Jonathan Richard RESIGNED | Director | 13 Aug 2007 | 12 Oct 2010 | United Kingdom | September 1969 | Apartment 16, Velvet House, 60 Sackville Street, Manchester, M1 3WE |
| PISHIRI, Mario Nicholas RESIGNED | Director | 05 May 2004 | 11 Jul 2007 | | December 1958 | Villa B 25, 32 Villas Complex, Al, Barsha Sector 373, Plot 0904, Al Barsha, Dubai, U A E |
| RICHARDSON, John RESIGNED | Director | | 11 Aug 1994 | | May 1945 | 43 Victoria Park Road, 1024, FOREIGN, Singapore |
| SANDERSON, Garry John RESIGNED | Director | 04 May 2012 | 03 Sep 2014 | England | November 1969 | Dominion House, Temple Court, Birchwood, Warrington, Cheshire, WA3 6GD, England |
| SCHOFIELD, Robert James RESIGNED | Director | 18 Aug 1999 | 30 Sep 2002 | United Kingdom | May 1946 | Two Stacks, 29 Guildford Road, Fleet, Hants, GU51 3EY |
| SCHOFIELD, Robert James RESIGNED | Director | | 11 Aug 1994 | United Kingdom | May 1946 | Two Stacks, 29 Guildford Road, Fleet, Hants, GU51 3EY |
| SMITH, David Anthony RESIGNED | Director | 18 Jun 2015 | 03 Jun 2024 | United Kingdom | September 1963 | Dominion House, Temple Court, Daten Avenue, Birchwood, Warrington, WA3 6GD, England |
| SMITH, David Anthony RESIGNED | Director | 22 Feb 2008 | 04 Apr 2012 | United Kingdom | September 1963 | 52, Woodlands Road, Hartford, Northwich, Cheshire, CW8 1NS |
| SMITH, Donald Lawrence RESIGNED | Director | 12 Apr 2005 | 27 Apr 2006 | | February 1950 | 7578 Crestview Drive, Niwot, Colorado 80501, Usa |
| STAPLES, Kenneth Derek RESIGNED | Director | | 02 Oct 1995 | | October 1930 | 15 Middle Road, Aylesbury, Buckinghamshire, HP21 7AD |
| TOLANEY, Murli RESIGNED | Director | 11 Aug 1994 | 27 Apr 2006 | | August 1941 | 132 Luben Lane, Arcadia, California, Los Angeles County 91006, Usa |
| TRUSSELL, Rhodes RESIGNED | Director | 11 Aug 1994 | 18 Aug 1999 | | January 1945 | 3780 Canfield Road, Pasadena, California, 91107, Usa |
| UHLER, Robert Bruce RESIGNED | Director | 11 Aug 1994 | 04 Apr 2012 | Usa | May 1946 | 8414, Strawberry Lane, Niwot, Colorado, 80503, Usa |
| VALCAMONICA, Marco RESIGNED | Director | 21 Sep 2009 | 01 Jan 2010 | | December 1950 | 1, Via Luigi Cislaghi, Milan, 20128, Italy |
| VALCAMONICA, Marco RESIGNED | Director | 12 Apr 2005 | 23 Jan 2009 | | December 1950 | Via Luigi, Cislaghi 1/, Milan, 20128, FOREIGN, Italy |
| VANDOORNE, Eric Jacques RESIGNED | Director | 01 Jan 2001 | 31 Jul 2001 | | August 1960 | Rue Geleytsbeek 48, Brussels, B-1180, FOREIGN, Belgium |
| WANKMULLER, Richard RESIGNED | Director | 01 Jan 2002 | 27 Jul 2007 | | March 1958 | 4486 Hogan Court, Longmont, Colorado 80503, Usa |
| WARDMAN, David RESIGNED | Director | 19 Jan 2010 | 31 Jan 2011 | England | June 1956 | Dominion House, Temple Court, Birchwood, Warrington, WA3 6GD, England |
| WILSON, Andrew Charles RESIGNED | Director | 18 Jul 2017 | 29 May 2020 | United States | August 1971 | 370, Interlocken Boulevard, Suite 300, Broomfield, Colorado, 80021, United States |