A well tool, comprising: a housing; an actuator sleeve in the housing; and an actuator in the housing comprising a spring and an internal shifting tool engaging profile, the actuator responsive, independent of well annulus pressure, to a remote hydraulic signal in a central bore (206, 208) of the well tool to change from an unactuated state, with the spring compressed, to an actuated state, with the spring expanded to shift the actuator sleeve from a first position to a second position, and the actuator responsive to reset to the unactuated state when the spring is re-compressed using the internal shifting tool engaging profile and characterised by a piston in the housing, the piston responsive, independent of well annulus pressure, to pressure cycles in the central bore (206, 208) to reciprocate in the housing; a spring mandrel in the housing coupled to move with an end of the spring as the spring expands, the spring mandrel comprising a latch finger; a sleeve in the housing comprising threads, the sleeve arranged to grip the latch finger and support the spring mandrel with the spring compressed when the sleeve is in a first position and to release the latch finger when the sleeve is in a second position; and a cam ring coupled to the piston to rotate in the housing by movement of the piston, the cam ring comprising threads that mate with the threads of the sleeve and when mated maintain the sleeve in the first position. a housing; an actuator sleeve in the housing; and an actuator in the housing comprising a spring and an internal shifting tool engaging profile, the actuator responsive, independent of well annulus pressure, to a remote hydraulic signal in a central bore (206, 208) of the well tool to change from an unactuated state, with the spring compressed, to an actuated state, with the spring expanded to shift the actuator sleeve from a first position to a second position, and the actuator responsive to reset to the unactuated state when the spring is re-compressed using the internal shifting tool engaging profile and characterised by the actuator responsive, independent of well annulus pressure, to a remote hydraulic signal in a central bore (206, 208) of the well tool to change from an unactuated state, with the spring compressed, to an actuated state, with the spring expanded to shift the actuator sleeve from a first position to a second position, and the actuator responsive to reset to the unactuated state when the spring is re-compressed using the internal shifting tool engaging profile and characterised by a piston in the housing, the piston responsive, independent of well annulus pressure, to pressure cycles in the central bore (206, 208) to reciprocate in the housing; a spring mandrel in the housing coupled to move with an end of the spring as the spring expands, the spring mandrel comprising a latch finger; a sleeve in the housing comprising threads, the sleeve arranged to grip the latch finger and support the spring mandrel with the spring compressed when the sleeve is in a first position and to release the latch finger when the sleeve is in a second position; and a cam ring coupled to the piston to rotate in the housing by movement of the piston, the cam ring comprising threads that mate with the threads of the sleeve and when mated maintain the sleeve in the first position.