| FROST, Nicholas Aaron ACTIVE | Director | 14 Aug 2023 | | United Kingdom | November 1983 | Morgan Advanced Materials Plc, York House, Sheet Street, Windsor, SL4 1DD, United Kingdom |
| BOULTON, Paul Andrew RESIGNED | Secretary | 31 Oct 2004 | 28 Jun 2018 | | | Quadrant, 55-57 High Street, Windsor, Berkshire, SL4 1LP |
| CRABB, Josephine Alison RESIGNED | Secretary | 23 Sep 2003 | 31 Oct 2004 | | | 75 Westwood Green, Cookham, Maidenhead, Berkshire, SL6 9DE |
| MACKIE, Stephanie Helen RESIGNED | Secretary | 28 Jun 2018 | 04 Jul 2022 | | | York House, Sheet Street, Windsor, SL4 1DD, United Kingdom |
| MARRINER, Elaine RESIGNED | Secretary | | 23 Sep 2003 | | | 48 Hemsdale, Pinkneys Green, Maidenhead, Berkshire, SL6 6SL |
| BECHHOLD, Alexander RESIGNED | Director | 20 May 2021 | 01 Nov 2021 | Germany | October 1964 | York House, Sheet Street, Windsor, SL4 1DD, United Kingdom |
| BOULTON, Paul Andrew RESIGNED | Director | 18 Sep 2020 | 15 Dec 2025 | United Kingdom | February 1968 | York House, Sheet Street, Windsor, SL4 1DD, United Kingdom |
| BOULTON, Paul Andrew RESIGNED | Director | 18 Apr 2016 | 28 Jun 2018 | United Kingdom | February 1968 | Quadrant, 55-57 High Street, Windsor, Berkshire, SL4 1LP |
| COKER, David John RESIGNED | Director | | 31 Dec 2006 | England | March 1946 | Ravenswood, 11 Star Hill Drive Churt, Farnham, Surrey, GU10 2HP |
| COLLINS, Claire Rose RESIGNED | Director | 19 Oct 2016 | 18 Sep 2020 | England | October 1974 | Quadrant, 55-57 High Street, Windsor, Berkshire, SL4 1LP |
| DANGERFIELD, Kevin Jeremy RESIGNED | Director | 14 Sep 2004 | 31 Mar 2016 | United Kingdom | January 1967 | Quadrant, 55-57 High Street, Windsor, Berkshire, SL4 1LP |
| DAVIES, David Charles RESIGNED | Director | 02 May 2000 | 31 Mar 2002 | | May 1955 | Hallcroft House Manor Road, Penn, High Wycombe, Buckinghamshire, HP10 8HY |
| MACKIE, Stephanie Helen RESIGNED | Director | 28 Jun 2018 | 04 Jul 2022 | United Kingdom | June 1968 | York House, Sheet Street, Windsor, SL4 1DD, United Kingdom |
| RILEY, Andrew Colin RESIGNED | Director | 18 Apr 2016 | 19 Oct 2016 | England | July 1967 | Quadrant, 55-57 High Street, Windsor, Berkshire, SL4 1LP |
| SWETMAN, Graham Dudley RESIGNED | Director | | 02 May 2000 | United Kingdom | September 1943 | Giles House, Broadlands Road, Brockenhurst, Hampshire, SO42 7SX |
| YOUNG, Nigel Robert RESIGNED | Director | 08 Apr 2002 | 14 Sep 2004 | England | June 1953 | Rosemullion, Bulstrode Way, Gerrards Cross, Buckinghamshire, SL9 7QU |