| MARWOOD, Neil ACTIVE | Secretary | 17 Feb 2011 | | | | Plasmor Ltd, Womersley Road, Knottingley, WF11 0DL, England |
| BROOKS-SHEA, Mark ACTIVE | Director | 01 Jan 2026 | | England | January 1979 | Plasmor Ltd, Womersley Road, Knottingley, WF11 0DL, England |
| HOWLEY, Michael ACTIVE | Director | 25 May 2023 | | England | December 1971 | Plasmor Ltd, Womersley Road, Knottingley, WF11 0DL, England |
| MARWOOD, Neil ACTIVE | Director | 01 Jan 2007 | | United Kingdom | October 1972 | Plasmor Ltd, Womersley Road, Knottingley, WF11 0DL, England |
| SLATER, Julian Antony ACTIVE | Director | 25 Jun 1997 | | England | February 1961 | Plasmor Ltd, Womersley Road, Knottingley, WF11 0DL, England |
| WAGSTAFF, Gillian ACTIVE | Director | 23 Jul 2024 | | England | May 1967 | Plasmor Ltd, Womersley Road, Knottingley, WF11 0DL, England |
| KNAGGS, Keith Anthony RESIGNED | Secretary | 25 Jun 1997 | 17 Feb 2011 | | | Felbridge, Normanby, Sinnington, York, N Yorkshire, YO62 6RH |
| SLATER, Patricia Elizabeth RESIGNED | Secretary | | 25 Jun 1997 | | | Water Lane, Whitley Bridge, Goole, N Yorkshire, DN14 0PH |
| HARDSTAFF, John Manning RESIGNED | Director | 01 Mar 2013 | 31 Aug 2014 | England | December 1948 | Plasmor Ltd, PO BOX 44 Womersley Road, Knottingley, West Yorkshire Wf11 Odn |
| KNAGGS, Keith Anthony RESIGNED | Director | 25 Jun 1997 | 31 Mar 2011 | United Kingdom | April 1944 | Felbridge, Normanby, Sinnington, York, N Yorkshire, YO62 6RH |
| MARSHALL, James Richard RESIGNED | Director | 01 Apr 2011 | 20 Sep 2025 | England | January 1971 | Plasmor Ltd, Womersley Road, Knottingley, WF11 0DL, England |
| SLATER, Antony John RESIGNED | Director | | 01 Mar 2013 | United Kingdom | May 1933 | Plasmor Ltd, PO BOX 44 Womersley Road, Knottingley, West Yorkshire Wf11 Odn |
| SLATER, Patricia Elizabeth RESIGNED | Director | | 01 Mar 2013 | United Kingdom | May 1933 | Plasmor Ltd, PO BOX 44 Womersley Road, Knottingley, West Yorkshire Wf11 Odn |
| SWAIN, John RESIGNED | Director | 26 Nov 1999 | 31 Mar 2023 | United Kingdom | November 1959 | Plasmor Ltd, PO BOX 44 Womersley Road, Knottingley, West Yorkshire, WF11 0DN |
| WILCOX, Michael RESIGNED | Director | 25 Jun 1997 | 31 Jul 2011 | United Kingdom | April 1951 | Plasmor Ltd, PO BOX 44 Womersley Road, Knottingley, West Yorkshire Wf11 Odn |