A method of manufacturing a composite article, the method comprising: providing a textile preform comprising a combination of filaments of reinforcing material with filaments of a thermoplastic matrix material; placing the preform in a mould; thermoforming the textile preform within the mould to consolidate the textile preform into a composite, the thermoforming including increasing the temperature above the melting temperature of the thermoplastic matrix material and applying pressure; cooling the composite within the mould to below the glass transition temperature of the thermoplastic matrix material, thereby forming a composite article; and removing the composite article from the mould; wherein at least a part of the filaments in the textile preform is in the form of (a) yarns each comprising a mixture of the reinforcing material filaments and the thermoplastic matrix material filaments combined to form a single comingled yarn, and/or (b) one or more yarns of the reinforcing material filaments combined with one or more yarns of the thermoplastic matrix material filaments; characterised in that the thermoplastic matrix material used in the method has a weight average molecular weight (M W) of at least 85 000, and wherein the thermoforming includes: a first phase during which the temperature within the mould is increased above the melting temperature of the thermoplastic matrix material at a first pressure in the range of 0.05 to 1.0 MPa; and a subsequent phase during which the pressure is increased gradually or stepwise to a second pressure of more than 1.0 MPa and up to 5.0 MPa, whilst maintaining the temperature within the mould above the melting temperature of the thermoplastic matrix material. providing a textile preform comprising a combination of filaments of reinforcing material with filaments of a thermoplastic matrix material; placing the preform in a mould; thermoforming the textile preform within the mould to consolidate the textile preform into a composite, the thermoforming including increasing the temperature above the melting temperature of the thermoplastic matrix material and applying pressure; cooling the composite within the mould to below the glass transition temperature of the thermoplastic matrix material, thereby forming a composite article; and removing the composite article from the mould; wherein at least a part of the filaments in the textile preform is in the form of (a) yarns each comprising a mixture of the reinforcing material filaments and the thermoplastic matrix material filaments combined to form a single comingled yarn, and/or (b) one or more yarns of the reinforcing material filaments combined with one or more yarns of the thermoplastic matrix material filaments; characterised in that the thermoplastic matrix material used in the method has a weight average molecular weight (M W) of at least 85 000, and wherein the thermoforming includes: a first phase during which the temperature within the mould is increased above the melting temperature of the thermoplastic matrix material at a first pressure in the range of 0.05 to 1.0 MPa; and a subsequent phase during which the pressure is increased gradually or stepwise to a second pressure of more than 1.0 MPa and up to 5.0 MPa, whilst maintaining the temperature within the mould above the melting temperature of the thermoplastic matrix material. a first phase during which the temperature within the mould is increased above the melting temperature of the thermoplastic matrix material at a first pressure in the range of 0.05 to 1.0 MPa; and a subsequent phase during which the pressure is increased gradually or stepwise to a second pressure of more than 1.0 MPa and up to 5.0 MPa, whilst maintaining the temperature within the mould above the melting temperature of the thermoplastic matrix material.