A wind turbine blade comprising: a first wind turbine blade portion having an upper shell half and a lower shell half that defines a suction side, pressure side, leading edge, and a trailing edge of the blade, the first blade portion further including a first blade interface at one end of the first blade portion; a second blade portion having an upper shell half and a lower shell half that defines a suction side, pressure side, leading edge, and a trailing edge of the blade, the second blade portion further including a second blade interface at one end of the second blade portion, wherein the first blade portion and the second blade portion are configured to be coupled together at the first and second blade interfaces; a connection joint for coupling the first and second blade portions (22, 24) together; a first spar cap associated with the upper shell half (44, 48) and a second spar cap associated with the lower shell half (46, 50) of each of the first and second blade portions (22, 24); and a shear web extending between the first spar cap and the second spar cap of each of the first and second blade portions, wherein the shear webs of the first and second blade portions (22, 24) are terminated away from the respective first and second blade interfaces (38, 42), and there is no shear web between the first and second spar caps (72, 74) extending in a longitudinal direction across the first and second blade interfaces when the first blade portion and the second blade portion are coupled together by the connection joint characterised in that the first and second spar caps (72, 74) form part of a load bearing structure extending in the longitudinal direction that carries flap-wise bending loads of the blade in use, and the load bearing structure of the first and second blade (22, 24) portions have a cross section that increases toward the respective first and second blade interfaces (38, 42). a first wind turbine blade portion having an upper shell half and a lower shell half that defines a suction side, pressure side, leading edge, and a trailing edge of the blade, the first blade portion further including a first blade interface at one end of the first blade portion; a second blade portion having an upper shell half and a lower shell half that defines a suction side, pressure side, leading edge, and a trailing edge of the blade, the second blade portion further including a second blade interface at one end of the second blade portion, wherein the first blade portion and the second blade portion are configured to be coupled together at the first and second blade interfaces; a connection joint for coupling the first and second blade portions (22, 24) together; a first spar cap associated with the upper shell half (44, 48) and a second spar cap associated with the lower shell half (46, 50) of each of the first and second blade portions (22, 24); and a shear web extending between the first spar cap and the second spar cap of each of the first and second blade portions, wherein the shear webs of the first and second blade portions (22, 24) are terminated away from the respective first and second blade interfaces (38, 42), and there is no shear web between the first and second spar caps (72, 74) extending in a longitudinal direction across the first and second blade interfaces when the first blade portion and the second blade portion are coupled together by the connection joint characterised in that the first and second spar caps (72, 74) form part of a load bearing structure extending in the longitudinal direction that carries flap-wise bending loads of the blade in use, and the load bearing structure of the first and second blade (22, 24) portions have a cross section that increases toward the respective first and second blade interfaces (38, 42).