A wall of a component of a gas turbine engine, the wall comprising: first and second wall surfaces (102, 104); an inlet located at the first wall surface; an outlet located at the second wall surface; a metering section commencing at the inlet and extending downstream from the inlet; and a diffusing section extending from the metering section and terminating at the outlet; wherein the outlet comprises: an upstream end; a downstream end; a first lateral edge extending between the upstream end and the downstream end, the first lateral edge diverging laterally from the upstream end and converging laterally before reaching the downstream end; and a second lateral edge opposite the first lateral edge extending between the upstream end and the downstream end, the second lateral edge diverging laterally from the upstream end and converging laterally before reaching the downstream end; and wherein the diffusing section comprises: a first lobe diverging longitudinally and laterally from the metering section; and a second lobe diverging longitudinally and laterally from the metering section; characterised in that the downstream end of the outlet is straight, extending between the first lateral edge and the second lateral edge, in that an angle ( θ 1) formed between a line tangent to the first lateral edge at its greatest lateral divergence and the downstream end is greater than about 75°, and in that an angle ( θ 2) formed between a line tangent to the second lateral edge at its greatest lateral divergence and the downstream end is greater than about 75°. first and second wall surfaces (102, 104); an inlet located at the first wall surface; an outlet located at the second wall surface; a metering section commencing at the inlet and extending downstream from the inlet; and a diffusing section extending from the metering section and terminating at the outlet; wherein the outlet comprises: an upstream end; a downstream end; a first lateral edge extending between the upstream end and the downstream end, the first lateral edge diverging laterally from the upstream end and converging laterally before reaching the downstream end; and a second lateral edge opposite the first lateral edge extending between the upstream end and the downstream end, the second lateral edge diverging laterally from the upstream end and converging laterally before reaching the downstream end; and wherein the diffusing section comprises: a first lobe diverging longitudinally and laterally from the metering section; and a second lobe diverging longitudinally and laterally from the metering section; characterised in that the downstream end of the outlet is straight, extending between the first lateral edge and the second lateral edge, in that an angle ( θ 1) formed between a line tangent to the first lateral edge at its greatest lateral divergence and the downstream end is greater than about 75°, and in that an angle ( θ 2) formed between a line tangent to the second lateral edge at its greatest lateral divergence and the downstream end is greater than about 75°. an upstream end; a downstream end; a first lateral edge extending between the upstream end and the downstream end, the first lateral edge diverging laterally from the upstream end and converging laterally before reaching the downstream end; and a second lateral edge opposite the first lateral edge extending between the upstream end and the downstream end, the second lateral edge diverging laterally from the upstream end and converging laterally before reaching the downstream end; and wherein the diffusing section comprises: a first lobe diverging longitudinally and laterally from the metering section; and a second lobe diverging longitudinally and laterally from the metering section; characterised in that a first lobe diverging longitudinally and laterally from the metering section; and a second lobe diverging longitudinally and laterally from the metering section; characterised in that the downstream end of the outlet is straight, extending between the first lateral edge and the second lateral edge, in that an angle ( θ 1) formed between a line tangent to the first lateral edge at its greatest lateral divergence and the downstream end is greater than about 75°, and in that an angle ( θ 2) formed between a line tangent to the second lateral edge at its greatest lateral divergence and the downstream end is greater than about 75°.