A hydraulic circuit architecture for a mobile work vehicle, the hydraulic circuit architecture comprising: a drive hydraulic pump driven by a prime mover, the drive hydraulic pump having a high pressure side and a low pressure side; a hydraulic work circuit adapted for connection to at least one actuator for driving a work component of the mobile work vehicle; a hydraulic propel circuit including a propel hydraulic motor for powering propulsion elements including wheels or tracks, the propel hydraulic motor being adapted to be connected to a drive train of the mobile work vehicle; and a circuit selector for selectively connecting the high pressure side of the drive hydraulic pump to the hydraulic work circuit and the hydraulic propel circuit; wherein the hydraulic circuit architecture is operable in: a) a first mode where the hydraulic propel circuit is connected to the high pressure side of the drive hydraulic pump and the hydraulic work circuit is disconnected from the high pressure side of the drive hydraulic pump; and b) a second mode where the hydraulic work circuit is connected to the high pressure side of the drive hydraulic pump and the hydraulic propel circuit is disconnected from the high pressure side of the drive hydraulic pump; characterised in that the hydraulic propel circuit includes a hydraulic accumulator, and wherein when the hydraulic circuit architecture is in the second mode, stored energy from the hydraulic accumulator can be used to drive the propel hydraulic motor to cause propulsion of the mobile work vehicle; and wherein the hydraulic circuit architecture further comprises a cross-over hydraulic flow line that provides fluid communication between the hydraulic work circuit and the hydraulic propel circuit, wherein a cross-over valve is provided for opening and closing the cross-over hydraulic flow line. a drive hydraulic pump driven by a prime mover, the drive hydraulic pump having a high pressure side and a low pressure side; a hydraulic work circuit adapted for connection to at least one actuator for driving a work component of the mobile work vehicle; a hydraulic propel circuit including a propel hydraulic motor for powering propulsion elements including wheels or tracks, the propel hydraulic motor being adapted to be connected to a drive train of the mobile work vehicle; and a circuit selector for selectively connecting the high pressure side of the drive hydraulic pump to the hydraulic work circuit and the hydraulic propel circuit; wherein the hydraulic circuit architecture is operable in: a) a first mode where the hydraulic propel circuit is connected to the high pressure side of the drive hydraulic pump and the hydraulic work circuit is disconnected from the high pressure side of the drive hydraulic pump; and b) a second mode where the hydraulic work circuit is connected to the high pressure side of the drive hydraulic pump and the hydraulic propel circuit is disconnected from the high pressure side of the drive hydraulic pump; characterised in that the hydraulic propel circuit includes a hydraulic accumulator, and wherein when the hydraulic circuit architecture is in the second mode, stored energy from the hydraulic accumulator can be used to drive the propel hydraulic motor to cause propulsion of the mobile work vehicle; and wherein the hydraulic circuit architecture further comprises a cross-over hydraulic flow line that provides fluid communication between the hydraulic work circuit and the hydraulic propel circuit, wherein a cross-over valve is provided for opening and closing the cross-over hydraulic flow line.