A stator vane for a gas turbine engine comprising: an airfoil extending radially from a first side of a platform , a pocket (90; 190) provided in the platform on a second side opposite the airfoil , forward and aft rails extending from the second side of the platform , one of the forward and aft rails including a radial surface (118;218); a cooling passage extending through the airfoil to the second side; and an impingement plate (108;208) secured to the platform over the pocket (90;190), the impingement plate (108;208) including a radial flange (120;220) engaging the radial surface (118;218), and an opening aligned with the cooling passage to provide fluid communication therebetween, wherein the pocket is circumscribed by a perimeter , the perimeter provided by the forward and aft rails and spaced apart lateral walls joining the forward and aft rails , wherein the second side includes a ridge circumscribing the cooling passage and engaging the impingement plate near the opening ,wherein the impingement plate (108;208) is unsupported immediately beneath the radial flange (120;220) in the radial direction and includes a cooling wall that provides the opening , and the cooling wall includes multiple cooling holes facing the second side; characterised in that : the impingement plate is supported by at least one pedestal near the radial flange in the radial direction, the second side includes multiple protrusions arranged beneath the multiple cooling holes , and the second side includes a recessed wall recessed with respect to and adjoining the lateral walls and the other of the forward and aft rails , the impingement plate (108;208) engaging the recessed wall . an airfoil extending radially from a first side of a platform , a pocket (90; 190) provided in the platform on a second side opposite the airfoil , forward and aft rails extending from the second side of the platform , one of the forward and aft rails including a radial surface (118;218); a cooling passage extending through the airfoil to the second side; and an impingement plate (108;208) secured to the platform over the pocket (90;190), the impingement plate (108;208) including a radial flange (120;220) engaging the radial surface (118;218), and an opening aligned with the cooling passage to provide fluid communication therebetween, wherein the pocket is circumscribed by a perimeter , the perimeter provided by the forward and aft rails and spaced apart lateral walls joining the forward and aft rails , wherein the second side includes a ridge circumscribing the cooling passage and engaging the impingement plate near the opening ,wherein the impingement plate (108;208) is unsupported immediately beneath the radial flange (120;220) in the radial direction and includes a cooling wall that provides the opening , and the cooling wall includes multiple cooling holes facing the second side; characterised in that : the impingement plate is supported by at least one pedestal near the radial flange in the radial direction, the second side includes multiple protrusions arranged beneath the multiple cooling holes , and the second side includes a recessed wall recessed with respect to and adjoining the lateral walls and the other of the forward and aft rails , the impingement plate (108;208) engaging the recessed wall . the impingement plate is supported by at least one pedestal near the radial flange in the radial direction, the second side includes multiple protrusions arranged beneath the multiple cooling holes , and the second side includes a recessed wall recessed with respect to and adjoining the lateral walls and the other of the forward and aft rails , the impingement plate (108;208) engaging the recessed wall . <EOS>