A heat shield for a gas turbine engine, the heat shield comprising a main body having a first surface and a second surface, the first surface being exposed to a hot working gas in use, a plurality of walls (74, 76, 78, 80) upstanding from the second surface, and an impingement plate, the impingement plate is attached to at least one wall of the plurality of walls (74, 76, 78, 80) and forms a chamber with the second surface and plurality of walls (74, 76, 78, 80) and comprises an array of impingement holes, at least one pair of divider walls (92, 94) comprising a first divider wall and a second divider wall formed within the chamber and extending between the impingement plate and the second surface, wherein the first divider wall having a length that extends from a first wall (74, 76, 78, 80) of the plurality of walls (74, 76, 78, 80) towards a second wall (74, 76, 78, 80), the second wall (74, 76, 78, 80) opposing the first wall (74, 76, 78, 80), the second divider wall having a length that extends from the second wall (74, 76, 78, 80) towards the first wall (74, 76, 78, 80), the first divider wall and second divider wall both extend such that they overlap one another viewed in a perpendicular direction to the first divider wall and/or second divider wall and the first divider wall and second divider wall are spaced apart with respect to the perpendicular direction, wherein the overlap is greater than 0% and less than 80% of the chamber in the direction of the length of the first and/or second divider walls (92, 94), wherein the at least one pair of divider walls divide the chamber into at least a first lateral zone and a central zone, the array of impingement holes has at least a first set of impingement holes opening into the first lateral zone and a second set of impingement holes opening into the central zone, the first set of impingement holes has a different arrangement of impingement holes compared to the second set of impingement holes, the different arrangement of impingement holes provides a different cooling effect. a main body having a first surface and a second surface, the first surface being exposed to a hot working gas in use, a plurality of walls (74, 76, 78, 80) upstanding from the second surface, and an impingement plate, the impingement plate is attached to at least one wall of the plurality of walls (74, 76, 78, 80) and forms a chamber with the second surface and plurality of walls (74, 76, 78, 80) and comprises an array of impingement holes, at least one pair of divider walls (92, 94) comprising a first divider wall and a second divider wall formed within the chamber and extending between the impingement plate and the second surface, wherein the first divider wall having a length that extends from a first wall (74, 76, 78, 80) of the plurality of walls (74, 76, 78, 80) towards a second wall (74, 76, 78, 80), the second wall (74, 76, 78, 80) opposing the first wall (74, 76, 78, 80), the second divider wall having a length that extends from the second wall (74, 76, 78, 80) towards the first wall (74, 76, 78, 80), the first divider wall and second divider wall both extend such that they overlap one another viewed in a perpendicular direction to the first divider wall and/or second divider wall and the first divider wall and second divider wall are spaced apart with respect to the perpendicular direction, wherein the overlap is greater than 0% and less than 80% of the chamber in the direction of the length of the first and/or second divider walls (92, 94), wherein the at least one pair of divider walls divide the chamber into at least a first lateral zone and a central zone, the array of impingement holes has at least a first set of impingement holes opening into the first lateral zone and a second set of impingement holes opening into the central zone, the first set of impingement holes has a different arrangement of impingement holes compared to the second set of impingement holes, the different arrangement of impingement holes provides a different cooling effect.