Improvements relating to the manufacture of wind turbines

A method of making an elongate wind turbine component, the method comprising:

• providing an elongate mould assembly extending in a longitudinal direction, the mould assembly comprising a mould surface and having a width that varies in the longitudinal direction;
• defining first and second tracks respectively on opposite longitudinal sides of the mould surface, the tracks extending longitudinally and the perpendicular distance between the tracks varying along the length of the tracks;
• providing a transport assembly comprising a pair of side supports arranged respectively to move along the first and second tracks, and a gantry supported above the mould assembly by the pair of side supports, the gantry extending transverse to the longitudinal direction;
• moving the transport assembly relative to the mould assembly in the longitudinal direction;
• depositing material in the mould by means of the transport assembly;
• and moving the side supports relative to one another in a direction transverse to the longitudinal direction in accordance with the varying distance between the tracks as the transport assembly moves in the longitudinal direction.