A method for manufacturing a turbine nozzle comprising: forming a plurality of nozzle segments, each nozzle segment comprising an endwall ring portion with at least one vane and the at least one vane has a free end portion; connecting the free end portion of the at least one vane of each nozzle segment of the plurality of nozzle segments to an annular endwall forming a segmented annular endwall concentric to the annular endwall with the at least one vane of each nozzle segment extending between the segmented annular endwall and the annular endwall, and circumferentially spacing the plurality of nozzle segments along the annular endwall with the endwall ring portion of each nozzle segment cooperating to form the segmented annular endwall; characterised by processing at least one nozzle segment of the plurality of nozzle segments prior to the connecting step, the step of processing comprises machining a feather-seal slot in opposing ends of at least two nozzle segments of the plurality of nozzle segments for receiving an interlocking feather seal; and sealing the plurality of nozzle segments together during or after the connecting step, the step of sealing comprising inserting the interlocking feather seal into intersecting feather-seal slots between adjacent nozzle segments, wherein the step of forming a plurality of nozzle segments comprises forming the plurality of nozzle segments with a single crystal material and the step of connecting the free end portion of the at least one vane of each nozzle segment of the plurality of nozzle segments to the annular endwall comprises casting the annular endwall around the free end portion of the at least one vane of each nozzle segment of the plurality of nozzle segments. forming a plurality of nozzle segments, each nozzle segment comprising an endwall ring portion with at least one vane and the at least one vane has a free end portion; connecting the free end portion of the at least one vane of each nozzle segment of the plurality of nozzle segments to an annular endwall forming a segmented annular endwall concentric to the annular endwall with the at least one vane of each nozzle segment extending between the segmented annular endwall and the annular endwall, and circumferentially spacing the plurality of nozzle segments along the annular endwall with the endwall ring portion of each nozzle segment cooperating to form the segmented annular endwall; characterised by processing at least one nozzle segment of the plurality of nozzle segments prior to the connecting step, the step of processing comprises machining a feather-seal slot in opposing ends of at least two nozzle segments of the plurality of nozzle segments for receiving an interlocking feather seal; and sealing the plurality of nozzle segments together during or after the connecting step, the step of sealing comprising inserting the interlocking feather seal into intersecting feather-seal slots between adjacent nozzle segments, wherein the step of forming a plurality of nozzle segments comprises forming the plurality of nozzle segments with a single crystal material and the step of connecting the free end portion of the at least one vane of each nozzle segment of the plurality of nozzle segments to the annular endwall comprises casting the annular endwall around the free end portion of the at least one vane of each nozzle segment of the plurality of nozzle segments.