A component formed by a manufacturing method of providing a prefabricated base member 12, and undertaking an additive manufacturing process, e.g. powder bed additive layer manufacturing, to construct features 16 thereupon to form a component 10 comprising the base and constructed features, which may be made of the same material, e.g. Inconel. The base may be supported by a support device (24, figure 3) with a recess within which the base is located, e.g. secured. The upper face of the base may be coplanar with the support device. The base may be formed using a CNC machining process. The face where the features are formed on may be non-planar, e.g. recesses or projections, e.g. ribs or grooves. To form integral separate components, the base may be divided after multiple features have been formed on different regions thereon.
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