A turbomachine comprising: a combustor assembly including a plurality of injection nozzles (37, 38) arranged to form a can-annular array; a transition piece including an inner wall defining a combustion flow passage; the transition piece further comprising an outer wall, wherein the transition piece defines an annular flow passage between the inner wall and the outer wall; wherein outer wall defines a plurality of openings that lead to the annular flow passage; at least one dilution orifice formed in the inner wall of the transition piece, the at least one dilution orifice guiding dilution gases to the combustion flow passage; the turbomachine being characterised in that it further comprises: a heat shield member mounted to the inner wall of the transition piece in the combustion flow passage, the heat shield member including a body having a first surface and an opposing second surface through which extends at least one dilution passage, the at least one dilution passage being off-set from the at least one dilution orifice, the heat shield member being spaced from the inner wall of the transition piece so as to define a flow region between the inner wall and the second surface, the flow region thermally decoupling the transition piece from combustion gases produced by the can-annular array of injection nozzles; at least one mounting member provided on the transition piece; and at least one mounting element provided in the second surface of the heat shield member, the at least one mounting member being adapted to interact with the at least one mounting element to mount the heat shield member to the transition piece. a combustor assembly including a plurality of injection nozzles (37, 38) arranged to form a can-annular array; a transition piece including an inner wall defining a combustion flow passage; the transition piece further comprising an outer wall, wherein the transition piece defines an annular flow passage between the inner wall and the outer wall; wherein outer wall defines a plurality of openings that lead to the annular flow passage; at least one dilution orifice formed in the inner wall of the transition piece, the at least one dilution orifice guiding dilution gases to the combustion flow passage; the turbomachine being characterised in that it further comprises: a heat shield member mounted to the inner wall of the transition piece in the combustion flow passage, the heat shield member including a body having a first surface and an opposing second surface through which extends at least one dilution passage, the at least one dilution passage being off-set from the at least one dilution orifice, the heat shield member being spaced from the inner wall of the transition piece so as to define a flow region between the inner wall and the second surface, the flow region thermally decoupling the transition piece from combustion gases produced by the can-annular array of injection nozzles; at least one mounting member provided on the transition piece; and at least one mounting element provided in the second surface of the heat shield member, the at least one mounting member being adapted to interact with the at least one mounting element to mount the heat shield member to the transition piece. a heat shield member mounted to the inner wall of the transition piece in the combustion flow passage, the heat shield member including a body having a first surface and an opposing second surface through which extends at least one dilution passage, the at least one dilution passage being off-set from the at least one dilution orifice, the heat shield member being spaced from the inner wall of the transition piece so as to define a flow region between the inner wall and the second surface, the flow region thermally decoupling the transition piece from combustion gases produced by the can-annular array of injection nozzles; at least one mounting member provided on the transition piece; and at least one mounting element provided in the second surface of the heat shield member, the at least one mounting member being adapted to interact with the at least one mounting element to mount the heat shield member to the transition piece.