Cooled component

A cooled component comprising a wall having a first surface and a second surface, the wall having a plurality of effusion cooling apertures extending there-through from the first surface to the second surface, the effusion cooling apertures being arranged at an angle to the second surface, each aperture having an inlet in the first surface and an outlet in the second surface, each effusion cooling aperture having a metering portion and a diffusing portion arranged in flow series from the inlet to the outlet, each metering portion being elongate and having a width and length, the width of each metering portion being greater than the length of the metering portion, each diffusing portion increasing in dimension in the length from the metering portion to the outlet, each outlet having a quadrilateral shape in the plane of the second surface of the wall, each inlet having an elongate shape in the plane of the first surface of the wall and the inlet in the first surface of the wall being arranged substantially diagonally with respect to the outlet in the second surface of the wall.