Composite plastics materials for use in manufacture; compounds of plastics (semi-processed); extruded plastics (semi-finished products); extruded plastics for use in manufacture; fibre-reinforced plastics material for use in manufacture; mixtures of plastics with fillers for use as intermediates; plastic for use in manufacture; plastics in extruded form for use in manufacture; recycled plastic materials for use in manufacture; reinforced plastics containing mica (semi-finished); reinforced plastics for use in manufacture; re-processed plastics for use in manufacture; semi-finished plastics materials; semi-processed plastics for use in manufacture