A combustor comprising: a combustor lining, a tile comprising a recess at an end defining a receiving surface, and a tile holder comprising: an elongate retaining head having a combustor surface configured to face a combustion chamber of a combustor, and a securing portion extending from the head, the securing portion being configured to secure the head to a combustor lining; wherein the retaining head extends laterally with respect to an elongate direction of the retaining head to define a retaining surface laterally adjacent to the securing portion; and wherein the retaining surface cooperates with the receiving surface of the tile to retain the tile against the combustor lining, wherein there are a plurality of securing portions, wherein the plurality of securing portions are discrete portions which are distributed along the elongate direction of the retaining head, and which extend from the side of the retaining head opposing the head combustor surface,wherein the securing portions each comprise a bolt protrusion which protrudes from the retaining head and which is threaded, and a nut, wherein the bolt protrusion is configured to extend through the combustor lining and to receive the nut to secure the tile holder to the combustor lining,and wherein the combustor lining comprises a series of corresponding apertures through which the securing portions extend in use, and wherein the bolt protrusions comprise a cooling hole through the length of the protrusion and through the corresponding portion of the elongate retaining head and the elongate head comprises a plurality of effusion cooling holes. a combustor lining, a tile comprising a recess at an end defining a receiving surface, and a tile holder comprising: an elongate retaining head having a combustor surface configured to face a combustion chamber of a combustor, and a securing portion extending from the head, the securing portion being configured to secure the head to a combustor lining; an elongate retaining head having a combustor surface configured to face a combustion chamber of a combustor, and a securing portion extending from the head, the securing portion being configured to secure the head to a combustor lining; wherein the retaining head extends laterally with respect to an elongate direction of the retaining head to define a retaining surface laterally adjacent to the securing portion; and wherein the retaining surface cooperates with the receiving surface of the tile to retain the tile against the combustor lining, wherein there are a plurality of securing portions, wherein the plurality of securing portions are discrete portions which are distributed along the elongate direction of the retaining head, and which extend from the side of the retaining head opposing the head combustor surface,wherein the securing portions each comprise a bolt protrusion which protrudes from the retaining head and which is threaded, and a nut, wherein the bolt protrusion is configured to extend through the combustor lining and to receive the nut to secure the tile holder to the combustor lining,and wherein the combustor lining comprises a series of corresponding apertures through which the securing portions extend in use, and wherein the bolt protrusions comprise a cooling hole through the length of the protrusion and through the corresponding portion of the elongate retaining head and the elongate head comprises a plurality of effusion cooling holes.