A tool system for moulding an article, the system comprising: a tool (300; 400) having: a mould layer (302; 402) defining a tool face (310; 410) for forming an article, and a temperature control surface (312; 412) opposite the tool face, the temperature control surface (312; 412) at least partially bounding a plurality of fluid chambers (318; 418) each having an exhaust, the tool face (310; 410) comprising a plurality of tool zones corresponding to the plurality of fluid chambers (318; 418); a further layer (308; 408) supporting the mould layer (302; 402) in use; and, an intermediate layer (360; 404) positioned between the mould layer and the further layer; and, heating and cooling means; in which, the heating means comprises a plurality of in-line heaters (340; 440) for heating fluid passing through a respective heating fluid flow path, each fluid flow path defined by a conduit with an inlet located in the further layer and an outlet located in one of the plurality of fluid chambers; and characterised in that, the cooling means comprises a cooling fluid flow path, the cooling fluid flow path defined by a conduit (351; 451) with an inlet (356; 456) located in the intermediate layer and an outlet located in one of the plurality of fluid chambers thereby bypassing the in-line heaters of the heating fluid flow path. a tool (300; 400) having: a mould layer (302; 402) defining a tool face (310; 410) for forming an article, and a temperature control surface (312; 412) opposite the tool face, the temperature control surface (312; 412) at least partially bounding a plurality of fluid chambers (318; 418) each having an exhaust, the tool face (310; 410) comprising a plurality of tool zones corresponding to the plurality of fluid chambers (318; 418); a further layer (308; 408) supporting the mould layer (302; 402) in use; and, an intermediate layer (360; 404) positioned between the mould layer and the further layer; and, heating and cooling means; in which, the heating means comprises a plurality of in-line heaters (340; 440) for heating fluid passing through a respective heating fluid flow path, each fluid flow path defined by a conduit with an inlet located in the further layer and an outlet located in one of the plurality of fluid chambers; and characterised in that, the cooling means comprises a cooling fluid flow path, the cooling fluid flow path defined by a conduit (351; 451) with an inlet (356; 456) located in the intermediate layer and an outlet located in one of the plurality of fluid chambers thereby bypassing the in-line heaters of the heating fluid flow path. a mould layer (302; 402) defining a tool face (310; 410) for forming an article, and a temperature control surface (312; 412) opposite the tool face, the temperature control surface (312; 412) at least partially bounding a plurality of fluid chambers (318; 418) each having an exhaust, the tool face (310; 410) comprising a plurality of tool zones corresponding to the plurality of fluid chambers (318; 418); a further layer (308; 408) supporting the mould layer (302; 402) in use; and, an intermediate layer (360; 404) positioned between the mould layer and the further layer; and, heating and cooling means; in which, the heating means comprises a plurality of in-line heaters (340; 440) for heating fluid passing through a respective heating fluid flow path, each fluid flow path defined by a conduit with an inlet located in the further layer and an outlet located in one of the plurality of fluid chambers; and characterised in that, the cooling means comprises a cooling fluid flow path, the cooling fluid flow path defined by a conduit (351; 451) with an inlet (356; 456) located in the intermediate layer and an outlet located in one of the plurality of fluid chambers thereby bypassing the in-line heaters of the heating fluid flow path. the heating means comprises a plurality of in-line heaters (340; 440) for heating fluid passing through a respective heating fluid flow path, each fluid flow path defined by a conduit with an inlet located in the further layer and an outlet located in one of the plurality of fluid chambers; and characterised in that, the cooling means comprises a cooling fluid flow path, the cooling fluid flow path defined by a conduit (351; 451) with an inlet (356; 456) located in the intermediate layer and an outlet located in one of the plurality of fluid chambers thereby bypassing the in-line heaters of the heating fluid flow path.