A composite structural component (2, 22, 32, 42, 52) comprising: an elongate member made of a polymer matrix composite material, the elongate member generally extending along an axis of the composite structural component (2, 22, 32, 42, 52) from an end portion (5, 25, 35, 45, 55) thereof; an end fitting (8, 28, 38, 48, 58) forming a mechanical joint with the end portion (5, 25, 35, 45, 55); and a rubber or elastomeric member; wherein the elongate member comprises: a first member (4, 24, 34, 44, 54) extending from the end portion (5, 25, 35, 45, 55) along the axis of the composite structural component (2, 22, 32, 42, 52) and comprising an end face, the rubber or elastomeric member arranged in contact with the end face, wherein the first member (4, 24, 34, 44, 54) is a filament wound structure comprising multiple layers wound at different angles; a second member (3, 23, 33, 43, 53) extending from the end portion (5, 25, 35, 45, 55) along the axis of the composite structural component (2, 22, 32, 42, 52); wherein the end fitting (8, 28, 38, 48, 58) is constrained in the end portion (5, 25, 35, 45, 55) by the first and second members (4, 24, 34, 44, 54; 3, 23, 33, 43, 53) such that the first member (4, 24, 34, 44, 54) is preloaded with a compressive stress in the axial direction and the second member (3, 23, 33, 43, 53) is preloaded with a tensile stress in the axial direction, and wherein the rubber or elastomeric member is arranged between the first member (4, 24, 34, 44, 54) and the end fitting (8, 28, 38, 48, 58). an elongate member made of a polymer matrix composite material, the elongate member generally extending along an axis of the composite structural component (2, 22, 32, 42, 52) from an end portion (5, 25, 35, 45, 55) thereof; an end fitting (8, 28, 38, 48, 58) forming a mechanical joint with the end portion (5, 25, 35, 45, 55); and a rubber or elastomeric member; wherein the elongate member comprises: a first member (4, 24, 34, 44, 54) extending from the end portion (5, 25, 35, 45, 55) along the axis of the composite structural component (2, 22, 32, 42, 52) and comprising an end face, the rubber or elastomeric member arranged in contact with the end face, wherein the first member (4, 24, 34, 44, 54) is a filament wound structure comprising multiple layers wound at different angles; a second member (3, 23, 33, 43, 53) extending from the end portion (5, 25, 35, 45, 55) along the axis of the composite structural component (2, 22, 32, 42, 52); wherein the end fitting (8, 28, 38, 48, 58) is constrained in the end portion (5, 25, 35, 45, 55) by the first and second members (4, 24, 34, 44, 54; 3, 23, 33, 43, 53) such that the first member (4, 24, 34, 44, 54) is preloaded with a compressive stress in the axial direction and the second member (3, 23, 33, 43, 53) is preloaded with a tensile stress in the axial direction, and wherein the rubber or elastomeric member is arranged between the first member (4, 24, 34, 44, 54) and the end fitting (8, 28, 38, 48, 58). a first member (4, 24, 34, 44, 54) extending from the end portion (5, 25, 35, 45, 55) along the axis of the composite structural component (2, 22, 32, 42, 52) and comprising an end face, the rubber or elastomeric member arranged in contact with the end face, wherein the first member (4, 24, 34, 44, 54) is a filament wound structure comprising multiple layers wound at different angles; a second member (3, 23, 33, 43, 53) extending from the end portion (5, 25, 35, 45, 55) along the axis of the composite structural component (2, 22, 32, 42, 52); wherein the end fitting (8, 28, 38, 48, 58) is constrained in the end portion (5, 25, 35, 45, 55) by the first and second members (4, 24, 34, 44, 54; 3, 23, 33, 43, 53) such that the first member (4, 24, 34, 44, 54) is preloaded with a compressive stress in the axial direction and the second member (3, 23, 33, 43, 53) is preloaded with a tensile stress in the axial direction, and wherein the rubber or elastomeric member is arranged between the first member (4, 24, 34, 44, 54) and the end fitting (8, 28, 38, 48, 58).