| FROST, Nicholas Aaron ACTIVE | Director | 02 Feb 2026 | | United Kingdom | November 1983 | Morgan Advanced Materials Plc, York House, Sheet Street, Windsor, SL4 1DD, United Kingdom |
| KNOWLES, Elizabeth ACTIVE | Director | 27 Sep 2024 | | United Kingdom | October 1984 | Morgan Advanced Materials Plc, York House, Sheet Street, Windsor, SL4 1DD, United Kingdom |
| BARRELL, Henry James RESIGNED | Secretary | | 14 Jun 1994 | | | 76 Portsmouth Road, Lee On The Solent, Hampshire, PO13 9AF |
| COOK, Lucy Henrietta RESIGNED | Secretary | 02 May 1995 | 07 Aug 2003 | | | 26 The Croft, Stubbington, Hampshire, PO14 2EY |
| GALLAGHER, Anthony Patrick RESIGNED | Secretary | 11 Jun 2010 | 12 Dec 2011 | | | 1 Upper Fforest Way, Morriston, Swansea, SA6 8PP |
| HARVEY, Jonathan RESIGNED | Secretary | 07 Aug 2003 | 11 Jun 2010 | | | 37 Mill Race, Neath Abbey, Neath, West Glamorgan, SA10 7FL |
| LATTER, Jonathan Mark RESIGNED | Secretary | 14 Jun 1994 | 02 Sep 1994 | | | 27 Porchester, South Ascot, Berkshire, SL5 9DY |
| MACKIE, Stephanie Helen RESIGNED | Secretary | 28 Jun 2018 | 04 Jul 2022 | | | York House, Sheet Street, Windsor, SL4 1DD, United Kingdom |
| MARRINER, Elaine RESIGNED | Secretary | 02 Sep 1994 | 02 May 1995 | | | 48 Hemsdale, Pinkneys Green, Maidenhead, Berkshire, SL6 6SL |
| ADDESSO, Gene A RESIGNED | Director | 23 Jun 1998 | 02 Aug 2001 | | July 1933 | 8845 Woodyhill Road, Raleigh 27612, N Carolina, Usa |
| BARRELL, Henry James RESIGNED | Director | | 14 Jun 1994 | United Kingdom | March 1953 | 76 Portsmouth Road, Lee On The Solent, Hampshire, PO13 9AF |
| 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, England |
| BOURNE, Julian John RESIGNED | Director | 23 Jun 1998 | 07 Aug 2003 | | November 1966 | Apartment 5,68 Chestnut Street, Beacon Hill, Boston, Ma 02108, Usa |
| BROWN, Francis Scott RESIGNED | Director | 28 Sep 1999 | 02 Aug 2001 | | July 1940 | 3681 Winding Pine Trail, Longwood 32779, Florida Usa, FOREIGN |
| BRYCE, Laurence Miller, Doctor RESIGNED | Director | 27 Jul 1995 | 15 May 2000 | | January 1943 | 49 Eastern Parade, Southsea, Portsmouth, Hampshire, PO4 9RE |
| CAVE, Norman RESIGNED | Director | | 04 Nov 1994 | England | December 1944 | 16 Ferndale Road, Chichester, West Sussex, PO19 6QJ |
| COLLINS, Claire Rose RESIGNED | Director | 19 Oct 2016 | 18 Sep 2020 | England | October 1974 | Quadrant, 55-57 High Street, Windsor, Berkshire, SL4 1LP, England |
| COOK, Lucy Henrietta RESIGNED | Director | 03 Dec 2002 | 07 Aug 2003 | | July 1964 | 26 The Croft, Stubbington, Hampshire, PO14 2EY |
| COWIE, Gordon RESIGNED | Director | 07 Aug 2003 | 28 Jul 2006 | | November 1952 | 214 Derlwyn, Dunvant, Swansea, West Glamorgan, SA2 7PE |
| DANGERFIELD, Kevin Jeremy RESIGNED | Director | 27 Jun 2005 | 31 Mar 2016 | United Kingdom | January 1967 | Quadrant, 55-57 High Street, Windsor, Berkshire, SL4 1LP, England |
| ELLIS, Roger Louis RESIGNED | Director | | 14 Jun 1994 | | October 1935 | 5 Avebury Park, Surbiton, Surrey, KT6 6SQ |
| GALLAGHER, Anthony Patrick RESIGNED | Director | 11 Jun 2010 | 12 Dec 2011 | United Kingdom | January 1954 | 1 Upper Fforest Way, Morriston, Swansea, SA6 8PP |
| HARVEY, Jonathan RESIGNED | Director | 07 Aug 2003 | 11 Jun 2010 | United Kingdom | December 1969 | 37 Mill Race, Neath Abbey, Neath, West Glamorgan, SA10 7FL |
| HOSTY, Andrew Joseph, Dr RESIGNED | Director | 03 Nov 1994 | 11 Mar 1996 | England | February 1965 | The Spinneys, Park Avenue, Camberley, Surrey, GU15 2NG |
| HUSSEY, Simon David RESIGNED | Director | 08 Feb 2000 | 07 Aug 2003 | | March 1968 | 17 Heathfield Avenue, Fareham, Hampshire, PO15 5QA |
| JONES, Stephen Geoffrey RESIGNED | Director | 07 Aug 2003 | 01 May 2007 | Wales | June 1956 | Sweet Briar, Oxwich Gower, Swansea, West Glamorgan, SA3 1LS |
| KIMLIN, Randy Philip RESIGNED | Director | | 08 Mar 1993 | | October 1949 | 325 Shadowmere Drive, Pelzer, South Carolina 29669, FOREIGN, Usa |
| MACFARLANE, William Edward RESIGNED | Director | 28 Sep 1999 | 08 Feb 2000 | | March 1948 | Little Barn, Holme Park Farm Lane, Sonning, Reading, Berkshire, RG4 6SX |
| MACKIE, Stephanie Helen RESIGNED | Director | 28 Jun 2018 | 04 Jul 2022 | United Kingdom | June 1968 | York House, Sheet Street, Windsor, SL4 1DD, United Kingdom |
| MANCINI, Walter, Dr RESIGNED | Director | 08 Feb 2000 | 07 Aug 2003 | | December 1949 | Via S Giacomo, 52 63037 Porto Dascoli, Ascoli Piceno, Italy |
| MARTIN, Eileen Kirsten RESIGNED | Director | 16 Dec 2021 | 27 Sep 2024 | United Kingdom | August 1978 | York House, Sheet Street, Windsor, SL4 1DD, United Kingdom |
| MOSELEY, Frederick, Doctor RESIGNED | Director | | 11 Mar 1996 | | May 1932 | 30 Somerville Road, Cobham, Surrey, KT11 2QU |
| NEWLAND, Barry George RESIGNED | Director | | 27 Jul 1995 | | July 1944 | 52 Shrubbery Road, Drakes Broughton, Pershore, Worcestershire, WR10 2BE |
| NICOLAI, Giacinto RESIGNED | Director | 27 Jul 1995 | 23 Jun 1998 | | January 1939 | Viale De Gasperi 280, 63033 Centobuchi, Ascoli Piceno, Italy |
| NORRIS, Ian Pearson RESIGNED | Director | | 13 Oct 1997 | | February 1943 | 28 Temple Mill Island, Marlow, Buckinghamshire, SL7 1SQ |
| QUINN, James David RESIGNED | Director | 28 Sep 1999 | 02 Aug 2001 | | October 1929 | Sherry Road, St Marys, Pennsylvania Pa 15858, Usa |
| RILEY, Andrew Colin RESIGNED | Director | 11 Jun 2010 | 19 Oct 2016 | England | July 1967 | Quadrant, 55-57 High Street, Windsor, Berkshire, SL4 1LP, England |
| STEELE, John Ernest RESIGNED | Director | | 24 Feb 1997 | | June 1935 | 7 Denebank, Monkseaton, Whitley Bay, Tyne & Wear, NE25 9AE |
| STUBBS, John Neville RESIGNED | Director | | 08 Feb 2000 | | July 1940 | Humble Cottage, 22 Wareham Road, Goring By Sea, West Sussex, BN12 |
| THEIN, Edward RESIGNED | Director | | 02 Aug 2001 | | March 1940 | 57 Rue Du Kiem, Capellen, Grand Duchy Of Luxembourg, FOREIGN, Luxembourg |
| WALDHEGER, Roy Allan RESIGNED | Director | 03 Nov 1994 | 28 Sep 1999 | | August 1938 | 115 Gibson Avenue, Narragansett, Rhode Island, 02882, Usa |