A root end joint for a wind turbine blade

A system for connecting a wind turbine blade sub-assembly to the hub. Subassembly comprising a tubular support member (40, 80), one end of which is arranged to be connected to the hub. At least two spaced-apart spacer (45,46,85a, 85b) extending transversely to the tubular support member and arranged to be mounted on a tubular member. Each spacer member having an opening for receiving the beam of a wind turbine blade airfoil, such that, in use, a portion of the beam member is supported by a partition flap within the tubular support member, so that the supporting spars projecting from the tubular member.