A seat assembly comprising: a seat casing comprising a bottom surface, a rear edge comprising a rear edge outward-facing surface, wherein the rear edge extends downward from the bottom surface in a vertical direction; and a lighting unit comprising a light output (22a, 22b), wherein the light output (22a, 22b) is coupled to at least one of the bottom surface or the rear edge outward-facing surface of the seat casing, wherein the light output (22a, 22b) extends across the seat casing in a lateral direction, and wherein the light output (22a, 22b) selectively provides light beneath the seat assembly; characterised in that the lighting unit further comprises: a controller comprising a processor and a memory storing a machine readable and executable instruction set; a sensor (37, 38, 92) communicatively coupled to the controller, wherein the sensor is a position sensor communicatively coupled to the controller; and wherein the light output (22a, 22b) is communicatively coupled to the controller; and the controller commands the lighting unit to change between an ON position in which the light output (22a, 22b) is engaged and illuminated and an OFF position in which the light output (22a, 22b) is disengaged and not illuminated based on a signal from the sensor, and the controller commands the lighting unit to change to the OFF position when the position sensor detects that the seat assembly is tilted at an angle with respect to a horizontal plane that is greater than a predetermined angle. a seat casing comprising a bottom surface, a rear edge comprising a rear edge outward-facing surface, wherein the rear edge extends downward from the bottom surface in a vertical direction; and a lighting unit comprising a light output (22a, 22b), wherein the light output (22a, 22b) is coupled to at least one of the bottom surface or the rear edge outward-facing surface of the seat casing, wherein the light output (22a, 22b) extends across the seat casing in a lateral direction, and wherein the light output (22a, 22b) selectively provides light beneath the seat assembly; characterised in that the lighting unit further comprises: a controller comprising a processor and a memory storing a machine readable and executable instruction set; a sensor (37, 38, 92) communicatively coupled to the controller, wherein the sensor is a position sensor communicatively coupled to the controller; and wherein the light output (22a, 22b) is communicatively coupled to the controller; and the controller commands the lighting unit to change between an ON position in which the light output (22a, 22b) is engaged and illuminated and an OFF position in which the light output (22a, 22b) is disengaged and not illuminated based on a signal from the sensor, and the controller commands the lighting unit to change to the OFF position when the position sensor detects that the seat assembly is tilted at an angle with respect to a horizontal plane that is greater than a predetermined angle. a controller comprising a processor and a memory storing a machine readable and executable instruction set; a sensor (37, 38, 92) communicatively coupled to the controller, wherein the sensor is a position sensor communicatively coupled to the controller; and wherein the light output (22a, 22b) is communicatively coupled to the controller; and the controller commands the lighting unit to change between an ON position in which the light output (22a, 22b) is engaged and illuminated and an OFF position in which the light output (22a, 22b) is disengaged and not illuminated based on a signal from the sensor, and the controller commands the lighting unit to change to the OFF position when the position sensor detects that the seat assembly is tilted at an angle with respect to a horizontal plane that is greater than a predetermined angle.