A vehicle seat assembly comprising a seat, and a seat track mounting adapted to slidingly mount the seat to a vehicle floor. The seat track mounting comprising an elongate slidingly engaged seat track member including a pair of spaced apart side flanges which define a channel section. The vehicle seat assembly further comprising a hydraulic actuator arranged in use to extend and retract as the seat is slidingly moved on the seat track mounting. This hydraulic actuator is located longitudinally within seat track member within the channel section and between the pair of side flanges.