A cooled component for a gas turbine engine, the component includes a segment region defining a segment of an annulus for passage of hot gases therethrough, the segment region having a pair of opposed side faces configured to lie substantially adjacent respective corresponding side faces of segments of similar operationally and circumferentially adjacent components, wherein: the segment region includes an elongate cooling slot in at least one of the side faces, the cooling slot being arranged in fluid communication with at least one flow passage within the segment region for a supply of cooling fluid to the slot, and the slot is substantially closed at an upstream end of the slot and open at a downstream end of the slot so as to define an outlet for the cooling fluid at an operationally downstream region of the at least one of the side faces.