| WEBB, Helen ACTIVE | Secretary | 31 May 2022 | | | | Hinton House, Birchwood Park Avenue, Birchwood, Warrington, WA3 6GR, England |
| GLASS, Michael Westland ACTIVE | Director | 21 Jul 2014 | | United Kingdom | October 1962 | Herdus House, Ingwell Drive, Westlakes Science & Technology Park, Moor Row, Cumbria, CA24 3HU, England |
| GREENWAY, James Alan ACTIVE | Director | 20 Jan 2026 | | England | July 1976 | Herdus House, Ingwell Drive, Westlakes Science & Technology Park, Moor Row, Cumbria, CA24 3HU |
| MCATEAR, Heather ACTIVE | Director | 23 Apr 2018 | | United Kingdom | January 1967 | Herdus House, Ingwell Drive, Westlakes Science & Technology Park, Moor Row, Cumbria, CA24 3HU |
| SMITHERS, Anthony Edward ACTIVE | Director | 10 Jul 2018 | | England | October 1968 | Herdus House, Ingwell Drive, Westlakes Science & Technology Park, Moor Row, Cumbria, CA24 3HU |
| ELLIOTT, Katy Laura RESIGNED | Secretary | 23 Sep 2021 | 20 Apr 2022 | | | Herdus House, Ingwell Drive, Westlakes Science & Technology Park, Moor Row, Cumbria, CA24 3HU |
| HODGSON, Elizabeth Helen RESIGNED | Secretary | 24 Feb 2021 | 23 Sep 2021 | | | Herdus House, Ingwell Drive, Westlakes Science & Technology Park, Moor Row, Cumbria, CA24 3HU |
| HODGSON, Helen Elizabeth RESIGNED | Secretary | 01 Apr 2008 | 09 Mar 2020 | | | 10, Brierydale Lane, Stainburn, Workington, Cumbria, CA14 4UH |
| REID, Colin Stuart RESIGNED | Secretary | 09 Mar 2020 | 23 Feb 2021 | | | Nuclear Decommissioning Authority, Hinton House, Birchwood Park Avenue, Birchwood, Warrington, Cheshire, WA3 6GR, England |
| REID, Colin Stuart RESIGNED | Secretary | 11 Dec 2007 | 01 Apr 2008 | | | 10 Treetops Close, Bruche, Warrington, Cheshire, WA1 3JA |
| REID, Colin Stuart RESIGNED | Secretary | 13 Mar 2002 | 14 Mar 2005 | | | 10 Treetops Close, Bruche, Warrington, Cheshire, WA1 3JA |
| REID, Colin Stuart RESIGNED | Secretary | 16 Sep 1994 | 01 Oct 1994 | | | 28 Lincoln Close, Woolston, Warrington, Cheshire, WA1 4LU |
| SHUTTLEWORTH, Alvin Joseph RESIGNED | Secretary | 14 Mar 2005 | 11 Dec 2007 | | | Oaklea 35 Teddington Close, Appleton, Warrington, Cheshire, WA4 5QG |
| SHUTTLEWORTH, Alvin Joseph RESIGNED | Secretary | 01 Oct 1994 | 13 Mar 2002 | | | Oaklea 35 Teddington Close, Appleton, Warrington, Cheshire, WA4 5QG |
| ATKINSON, David Mark RESIGNED | Director | 01 Apr 2008 | 30 Nov 2019 | England | June 1962 | Herdus House, Ingwell Drive, Westlakes Science & Technology Park, Moor Row, Cumbria, CA24 3HU, England |
| BALMER, Sean Lee RESIGNED | Director | 22 Nov 2010 | 31 Mar 2014 | United Kingdom | April 1967 | Herdus House, Ingwell Drive, Westlakes Science & Technology Park, Moor Row, Cumbria, CA24 3HU, England |
| BONSER, David Richard RESIGNED | Director | 16 Jan 1995 | 13 Mar 2002 | England | April 1949 | The Old Dairy, South Town Road, Medstead, Alton, Hampshire, GU34 5PP |
| CHAMBERLAIN, Leslie Neville RESIGNED | Director | 01 Oct 1994 | 20 Sep 1996 | England | October 1939 | Oaklands, 2 The Paddock Hinderton Road, Neston, Cheshire, CH64 9PH |
| CHIESE, Ross Anthony Norman RESIGNED | Director | 01 Oct 1994 | 01 Aug 2000 | United Kingdom | July 1950 | 14 Bishops Avenue, Northwood, Middlesex, HA6 3DG |
| CLARKE, John Simon RESIGNED | Director | 15 May 2009 | 22 Nov 2010 | England | February 1959 | Herdus House, Ingwell Drive, Westlakes Science & Technology Park, Moor Row, Cumbria, CA24 3HU, England |
| EDWARDS, John Frederick RESIGNED | Director | 13 Mar 2002 | 01 Apr 2008 | England | October 1948 | 32 High Street, Warwick, Warwickshire, CV34 4AX |
| HIGGINS, Robert Andrew Bryson RESIGNED | Director | 19 May 2014 | 01 Oct 2017 | United Kingdom | August 1965 | Herdus House, Ingwell Drive, Westlakes Science & Technology Park, Moor Row, Cumbria, CA24 3HU, England |
| MAY, Derek RESIGNED | Director | 01 Oct 1994 | 30 Nov 2000 | | August 1955 | Trinity House, Lyons Lane, Appleton, Warrington, WA4 5JG |
| MEDLOCK, David Richard RESIGNED | Director | 13 Aug 2020 | 18 Dec 2025 | England | May 1960 | Herdus House, Ingwell Drive, Westlakes Science & Technology Park, Moor Row, Cumbria, CA24 3HU |
| OLDHAM, Andrew Michael Colin RESIGNED | Director | 01 Apr 2008 | 06 Dec 2017 | England | October 1959 | Herdus House, Ingwell Drive, Westlakes Science & Technology Park, Moor Row, Cumbria, CA24 3HU, England |
| SHUTTLEWORTH, Alvin Joseph RESIGNED | Director | 13 Mar 2002 | 11 Dec 2007 | United Kingdom | October 1950 | Oaklea 35 Teddington Close, Appleton, Warrington, Cheshire, WA4 5QG |
| WALKER, Phillip Ross RESIGNED | Director | 16 Sep 1994 | 01 Oct 1994 | | December 1951 | 249 Kingsway, Cheadle, Cheshire, SK8 1LA |