A method of producing long fibre thermoplastic LFT extruded material, wherein the method comprises providing thermoplastic feed material, thermoplastic composite TPC feed material, for example flakes or chips, wherein the TPC feed material comprises pieces, wherein the pieces individually comprise both fibres and thermoplastic material, wherein the method comprises an extrusion step carried out in an extrusion system (1), wherein the extrusion system (1) comprises an extruder (2) having an extrusion direction (ED), wherein the extruder (2) comprises a barrel (3), a single screw (4), a first inlet opening (6) and an outlet opening (5), wherein the screw (4) provides a channel (8) in the extruder (2), and wherein the extrusion step involves supplying the thermoplastic feed material and the TPC feed material to the extruder (2), then conveying a mixture of the thermoplastic feed material and the TPC feed material to said outlet opening (5) to thereby give a compounded material C, then extruding the compounded material C through said outlet opening (5) to give LFT extruded material D.