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 upstanding from the second surface , and an impingement plate , the impingement plate is attached to at least one wall of the plurality of walls and forms a chamber with the second surface and plurality of walls and comprises an array of impingement holes , at least one pair of divider walls 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 of the plurality of walls towards a second wall , the second wall opposing the first wall , the second divider wall having a length that extends from the second wall towards the first wall , 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 , 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 upstanding from the second surface , and an impingement plate , the impingement plate is attached to at least one wall of the plurality of walls and forms a chamber with the second surface and plurality of walls and comprises an array of impingement holes , at least one pair of divider walls 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 of the plurality of walls towards a second wall , the second wall opposing the first wall , the second divider wall having a length that extends from the second wall towards the first wall , 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 , 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. <EOS>