The present disclosure relates to a method of controlling one or more vehicle systems. The method uses at least one sensor (3-1, 3-2) to monitor a driver (D) to identify a driver distracted state. One or more functions of a first vehicle system (7, 9, 17) are inhibited when the driver distracted state is identified. The present application also relates to a control apparatus (1); and to a vehicle (V). The present disclosure also relates to a method and related apparatus for controlling the output of a visual notification within the vehicle (V).