A wind turbine blade comprising: a first blade portion having a shell that defines a suction side, a pressure side, a leading edge, and a trailing edge of the blade, the first blade portion further including a first spar cap portion; a second blade portion having a shell that defines a suction side, a pressure side, a leading edge, and a trailing edge of the blade, the second blade portion further including a second spar cap portion; and a connection joint for coupling the first and second blade portions (22, 24) together, characterised in that the connection joint includes: a plurality of first layers associated with the first spar cap portion and having at least one cut out at one end, the cut out being open at the end of the first layers; a plurality of second layers associated with the second spar cap portion and having at least one cut out at one end, the cut out being open at the end of the second layers; and a plurality of fasteners, wherein the plurality of first layers and the plurality of second layers are interleaved with their cut outs aligned, and the fasteners pass through the cut outs of the plurality of first and second layers and are tensioned to clamp together the interleaved plurality of first and second layers between the first and second blade portions (22, 24). a first blade portion having a shell that defines a suction side, a pressure side, a leading edge, and a trailing edge of the blade, the first blade portion further including a first spar cap portion; a second blade portion having a shell that defines a suction side, a pressure side, a leading edge, and a trailing edge of the blade, the second blade portion further including a second spar cap portion; and a connection joint for coupling the first and second blade portions (22, 24) together, characterised in that the connection joint includes: a plurality of first layers associated with the first spar cap portion and having at least one cut out at one end, the cut out being open at the end of the first layers; a plurality of second layers associated with the second spar cap portion and having at least one cut out at one end, the cut out being open at the end of the second layers; and a plurality of fasteners, wherein the plurality of first layers and the plurality of second layers are interleaved with their cut outs aligned, and the fasteners pass through the cut outs of the plurality of first and second layers and are tensioned to clamp together the interleaved plurality of first and second layers between the first and second blade portions (22, 24). a plurality of first layers associated with the first spar cap portion and having at least one cut out at one end, the cut out being open at the end of the first layers; a plurality of second layers associated with the second spar cap portion and having at least one cut out at one end, the cut out being open at the end of the second layers; and a plurality of fasteners, wherein the plurality of first layers and the plurality of second layers are interleaved with their cut outs aligned, and the fasteners pass through the cut outs of the plurality of first and second layers and are tensioned to clamp together the interleaved plurality of first and second layers between the first and second blade portions (22, 24).