A heat shield for a gas turbine engine has a main body having a first and second surface, the first surface exposed to a hot working gas, a plurality of walls upstanding from the second surface and an impingement plate. The impingement plate is on top of at least one wall and forms a chamber and has an array of impingement holes. At least one pair of divider walls are formed within the chamber and extend between the impingement plate and the second surface. The first divider wall extends from a first wall towards a second wall, the second divider wall extends from the second wall towards the first wall. The first and second divider walls both extend such that there is no clear line of sight in a perpendicular direction to the first divider wall and/or second divider wall and are spaced apart with respect to the perpendicular direction.