| RIDLEY, Jane ACTIVE | Secretary | 01 Feb 2012 | | | | Power Solutions House, Presley Way, Crownhill, Milton Keynes, MK8 0ES, United Kingdom |
| COOPER, Matthew Scott ACTIVE | Director | 01 Jan 2015 | | United Kingdom | February 1974 | Power Solutions House, Presley Way, Crownhill, Milton Keynes, MK8 0ES |
| INAMORI, Akira ACTIVE | Director | 01 Jul 2025 | | United Kingdom | December 1972 | Power Solutions House, Presley Way, Crownhill, Milton Keynes, MK8 0ES |
| NAKAYAMA, Masanari ACTIVE | Director | 01 Jul 2025 | | United Kingdom | November 1968 | Power Solutions House, Presley Way, Crownhill, Milton Keynes, MK8 0ES |
| PIMPIS, Stephen Jerome ACTIVE | Director | 01 Jul 2015 | | United States | October 1962 | Power Solutions House, Presley Way, Crownhill, Milton Keynes, MK8 0ES |
| TAGO, Masanari ACTIVE | Director | 01 Nov 2024 | | United Kingdom | January 1969 | Power Solutions House, Presley Way, Crown Hill, Milton Keynes, Buckinghamshire, MK8 0ES, England |
| BOLTON, Geoffrey Alan RESIGNED | Secretary | | 20 Apr 1993 | | | 3 St Josephs Close, Olney, Buckinghamshire, MK46 5HD |
| ELLAM, Katharine Louise RESIGNED | Secretary | 26 Jun 1997 | 11 Apr 2002 | | | 1 Shelsmore, Giffard Park, Milton Keynes, Buckinghamshire, MK14 5HU |
| HATCHER, James Boyd RESIGNED | Secretary | 11 Apr 2002 | 01 Feb 2012 | | | 1, Tanners Drive, Blakelands North, Milton Keynes, Bucks, MK14 5BU, United Kingdom |
| SANDILANDS, Alexander Hew Astley RESIGNED | Secretary | 20 Apr 1993 | 26 Jun 1997 | | | Baldon House, Marsh Baldon, Oxford, Oxfordshire, OX44 9LS |
| BACHRACH, William, Dr RESIGNED | Director | 14 Jun 2006 | 12 Jun 2009 | | January 1959 | 11 Cabot Blvd, Mansfield, Massachusetts Ma 02048, United States Of America |
| BAXTER, John Robert, Doctor RESIGNED | Director | | 31 Dec 2002 | | September 1941 | 21 Eliot Close, Newport Pagnell, Buckinghamshire, MK16 8QS |
| BIZEN, Tatsuo RESIGNED | Director | 01 Apr 2012 | 01 Jul 2025 | Japan | July 1961 | 1-10-1, Higashikotari, Nagaokakyo, Kyoto, 617-8555, Japan |
| BOLTON, Geoffrey Alan RESIGNED | Director | | 20 Apr 1993 | | April 1953 | 3 St Josephs Close, Olney, Buckinghamshire, MK46 5HD |
| BUTTERWICK, Martin Paul RESIGNED | Director | 01 Jan 1998 | 01 Dec 2003 | | May 1960 | 1 Bakery Close, Cranfield, Bedford, MK43 0HE |
| CONLIN, Christopher Gregory RESIGNED | Director | 01 Jun 2010 | 22 Feb 2012 | United States Of America | April 1953 | 11, Cabot Boulevard, Mansfield, Bristol, 02048, United States Of America |
| CUMMINGS, John Philip RESIGNED | Director | 31 Jan 1994 | 28 Jun 2002 | | March 1945 | 18 Park Avenue, Poynton, Stockport, Cheshire, SK12 1QY |
| FUJITA, Yoshitaka RESIGNED | Director | 05 Nov 2007 | 29 Jun 2012 | | January 1952 | 3-1-9 Takadai, Nagaokakyo, Kyoto, 617-0847, FOREIGN, Japan |
| HARVIE, Ian Jeffery RESIGNED | Director | 14 Jun 2006 | 31 Aug 2007 | | May 1963 | 2832 Ogden Street, Philadelphia, Pennsylvania 19130, Usa |
| HILL, Robert David RESIGNED | Director | 01 Jan 1998 | 31 Aug 2007 | United Kingdom | December 1966 | 71 The Limes, Stony Stratford, Milton Keynes, Buckinghamshire, MK11 1ET |
| JOHNSON, James Dean RESIGNED | Director | 13 Sep 2001 | 12 Sep 2005 | | June 1957 | 11068 N Cloudview Place, Tucson, Arizona 85737, Usa |
| KOTERA, Yoshitaka RESIGNED | Director | 22 Feb 2012 | 01 Apr 2012 | Japan | March 1955 | Sekiryu 25, Murasakimo, Kita-Ku, Kyoto, 603-8212, Japan |
| LAURIE, John Kendall RESIGNED | Director | | 31 Jul 2002 | Scotland | June 1949 | Vaasetter, Portling, Dalbeattie, Kirkcudbrightshire, DG5 4PZ |
| MACWATERS, Peter RESIGNED | Director | | 20 Apr 1993 | | October 1944 | 46 Boxberry Gardens, Walnut Tree, Milton Keynes, Buckinghamshire, MK7 7EW |
| MAKINO, Koji RESIGNED | Director | 29 Jun 2012 | 01 Jul 2015 | Japan | May 1952 | 9-14, I Cho-Me, Goryouooeyamachou, Nishikyoku, Kyoto, Japan |
| MARKERT JR, Stephen E RESIGNED | Director | 15 Dec 2000 | 14 Dec 2005 | | June 1951 | 1460 Creek View Lane, Blue Bell, Pennsylvania, 19422, Usa |
| MIKAMI, Shuji RESIGNED | Director | 01 Jul 2020 | 01 Nov 2024 | Japan | October 1964 | Tenjin 2 - 26 - 10, Nagaokakyo-Shi, Kyoto, 617 - 8566, Japan |
| MORISHIMA, Yasuyuki RESIGNED | Director | 12 Jun 2009 | 01 Jul 2015 | | October 1956 | 11-1 Takigiogiki, Kyotanabe, Kyoto, 610-0341, Japan |
| NAKAJIMA, Norio RESIGNED | Director | 01 Jul 2015 | 25 Jun 2020 | Japan | September 1961 | 58-26, Gungeshinmachi Takatsuki-Shi, Osaka-Fu, 569-113, Japan |
| NEOPHITOU, George Onoufrios RESIGNED | Director | 26 Jun 1997 | 01 Jan 2015 | England | July 1959 | Power Solutions House, Presley Way, Crownhill, Milton Keynes, MK8 0ES, United Kingdom |
| NEOPHITOU, George RESIGNED | Director | 22 Feb 1994 | 31 Oct 1996 | | July 1959 | 1 Worcester Close, Little Billing, Northampton, Northamptonshire, NN3 9GE |
| OKAMOTO, Yasuji RESIGNED | Director | 05 Nov 2007 | 31 Mar 2010 | | November 1949 | 3-9-3 Kosone-Cho, Nishinomiya, Hyogo, 663-8122, Japan |
| PLUMMER, Paul Timothy RESIGNED | Director | 01 Jan 1998 | 30 Aug 2002 | United Kingdom | May 1945 | Pear Tree Cottage, Main Street,, Chackmore, Buckinghamshire, MK18 5JF |
| RICH, John C, Doctor RESIGNED | Director | 15 Dec 2000 | 06 Sep 2001 | | October 1937 | 6531 N Regal Manor Drive, Tucson, Pima County, 85750, Usa |
| SAKAMOTO, Hideo RESIGNED | Director | 14 Sep 2009 | 29 Jun 2012 | | October 1948 | Kotari 2-5-1, Nagaokakyo, Kyoto, Japan |
| STEEPER, Clive Maurice Hugh RESIGNED | Director | 03 Dec 1991 | 31 Dec 1993 | | July 1954 | Chestnut Farmhouse Worminghall Road, Ickford, Aylesbury, Buckinghamshire, HP18 9JB |
| TAKEMURA, Yoshito RESIGNED | Director | 05 Nov 2007 | 12 Jun 2009 | | January 1957 | 414, Mount Hope Street, Aprt 205#, North Attleboro, MA 02760, United States Of America |
| THOMAS, John Rees RESIGNED | Director | | 03 Apr 2001 | | January 1943 | 55 Carters Close, Sherington, Newport Pagnell, Buckinghamshire, MK16 9NW |