the illustrated part for the sake of clarity each heat shield 3 4 includes a root body portion 18 which is generally triangular in cross section with radiussed corners the slot 15 16 for accommodating the root body is correspondingly configured but of larger dimensions so that the root body portion 18 may rock to a limited degree in the axial direction within the slot 16 as shown in fig2 the shape and configurations of the blade and heat shields and their respective root portions are generally complex but known for this reason they will not be described further in detail the portions of the structure which are predominantly significant in defining this embodiment of the invention are illustrated in close up form in fig1 to which reference is now directed the expansion gap between the blade 2 and each heat shield 3 4 is sealed by a respective sealing element 5 6 each sealing element is somewhat t shaped in cross section and arcuate to conform with the radius of curvature of the rotor at the radial location at which it is located during use the sealing elements 5 6 may therefore be considered segments of a ring in which the cross bar of the u2018 t u2019 is aligned radially and the stem of the u2018 t u2019 is aligned radially in the assembled state illustrated in fig1 each sealing element 5 6 is accommodated within a respective radially and circumferentially extending slot 9 10 provided within the blade 2 and a respective axially and circumferentially extending slot 7 8 provided in the adjacent heat shield 3 4 to conform with.