A wind turbine blade bushing system ( 440, 540) for arrangement in a root end of a wind turbine blade, the wind turbine blade bushing system ( 440, 540) comprising: - a threaded element ( 480, 580) for retaining a mounting bolt for a wind turbine blade, the threaded element ( 480, 580) being formed from a first material; and - an anchor element (482, 582) for arrangement at a root end face of the wind turbine blade, wherein the anchor element ( 482, 582) acts to at least partly retain the threaded element ( 480, 580) in the wind turbine blade, the anchor element ( 482, 582) being formed from a second material, - wherein the first material has a higher strength and higher fracture toughness than the second material, - wherein the threaded element ( 480, 580) is a bolt-receiving nut for receiving a mounting bolt for a wind turbine blade, - wherein the anchor element ( 482, 582) comprises a tubular member for arrangement at the root end of the wind turbine blade so as to retain the tubular member in a wind turbine blade body, - wherein the tubular member acts to at least partly retain the bolt-receiving nut in the wind turbine blade, - wherein the tubular member comprises a first open end (485, 585) to receive a bolt, whereir an internal chamber of the tubular member comprises a first constriction (487, 587) between a location of the bolt-receiving nut in the tubular member and the first open end so as to retain the bolt-receiving nut in the tubular member, and - wherein the tubular member comprises a second end (486, 586) opposed to the first end wherein an internal chamber of the tubular member comprises a second constriction (488, 588) between the location of the bolt-receiving nut in the tubular member and the second end so as to retain the bolt-receiving nut in place relative to the second end of the tubular member, whereby the bolt-receiving nut is arranged in an interior part of the tubular member, and such that the first constriction and the second constriction in conjunction are adapted to retain the bolt-receiving nut. - a threaded element ( 480, 580) for retaining a mounting bolt for a wind turbine blade, the threaded element ( 480, 580) being formed from a first material; and - an anchor element (482, 582) for arrangement at a root end face of the wind turbine blade, wherein the anchor element ( 482, 582) acts to at least partly retain the threaded element ( 480, 580) in the wind turbine blade, the anchor element ( 482, 582) being formed from a second material, - wherein the first material has a higher strength and higher fracture toughness than the second material, - wherein the threaded element ( 480, 580) is a bolt-receiving nut for receiving a mounting bolt for a wind turbine blade, - wherein the anchor element ( 482, 582) comprises a tubular member for arrangement at the root end of the wind turbine blade so as to retain the tubular member in a wind turbine blade body, - wherein the tubular member acts to at least partly retain the bolt-receiving nut in the wind turbine blade, - wherein the tubular member comprises a first open end (485, 585) to receive a bolt, whereir an internal chamber of the tubular member comprises a first constriction (487, 587) between a location of the bolt-receiving nut in the tubular member and the first open end so as to retain the bolt-receiving nut in the tubular member, and - wherein the tubular member comprises a second end (486, 586) opposed to the first end wherein an internal chamber of the tubular member comprises a second constriction (488, 588) between the location of the bolt-receiving nut in the tubular member and the second end so as to retain the bolt-receiving nut in place relative to the second end of the tubular member, whereby the bolt-receiving nut is arranged in an interior part of the tubular member, and such that the first constriction and the second constriction in conjunction are adapted to retain the bolt-receiving nut.