Wind turbine apparatus for releasably attaching one or more wind turbine blades to a wind turbine rotor hub, comprising: a first and a second support arm mounted on the wind turbine tower, and having connectors (526,552) for making a secure releasable connection with an individual wind turbine blade at one or more respective connection points; characterised in that: the first and second support arms (52,54) have an extended position and a stowed position, wherein in the extended position the first and a second arms extend from the tower and support the wind turbine blade in a position for connection to the wind turbine rotor hub, and wherein in the stowed position the first and a second arms lie close to the tower and support the blade in a stowed position against the tower; a winch or pulley is provided having a cable for attachment to the blade root, such that when the wind turbine blade is detached from the wind turbine rotor hub, at least part of the weight of the wind turbine blade is supported on the cable, and in that the first and second support arms (52,54) are both located towards an upper region of the wind turbine tower and arranged to support the wind turbine blade at one or more respective connection points closer to a blade root portion of the blade than to a blade tip portion. a first and a second support arm mounted on the wind turbine tower, and having connectors (526,552) for making a secure releasable connection with an individual wind turbine blade at one or more respective connection points; characterised in that: the first and second support arms (52,54) have an extended position and a stowed position, wherein in the extended position the first and a second arms extend from the tower and support the wind turbine blade in a position for connection to the wind turbine rotor hub, and wherein in the stowed position the first and a second arms lie close to the tower and support the blade in a stowed position against the tower; a winch or pulley is provided having a cable for attachment to the blade root, such that when the wind turbine blade is detached from the wind turbine rotor hub, at least part of the weight of the wind turbine blade is supported on the cable, and in that the first and second support arms (52,54) are both located towards an upper region of the wind turbine tower and arranged to support the wind turbine blade at one or more respective connection points closer to a blade root portion of the blade than to a blade tip portion. the first and second support arms (52,54) have an extended position and a stowed position, wherein in the extended position the first and a second arms extend from the tower and support the wind turbine blade in a position for connection to the wind turbine rotor hub, and wherein in the stowed position the first and a second arms lie close to the tower and support the blade in a stowed position against the tower; a winch or pulley is provided having a cable for attachment to the blade root, such that when the wind turbine blade is detached from the wind turbine rotor hub, at least part of the weight of the wind turbine blade is supported on the cable, and in that the first and second support arms (52,54) are both located towards an upper region of the wind turbine tower and arranged to support the wind turbine blade at one or more respective connection points closer to a blade root portion of the blade than to a blade tip portion.