A hydraulic servo valve comprising: a valve chamber; a pair of fluid receiving ports (208a, 208b); a movable member disposed between the pair of ports (208a, 208b) and movable within the valve chamber along an axis, wherein the movable member comprises a pair of openings (213a, 213b), each facing a respective one of the ports (208a, 208b) to permit fluid to flow from the valve chamber to the ports (208a, 208b) via the openings (213a, 213b) in use, wherein a fluid pressure at each of the ports (208a, 208b) is dependent upon an alignment of each of the openings (213a, 213b) with a respective one of the ports (208a, 208b), and movement of the movable member along the axis is configured to move the openings (213a, 213b) into and out of alignment with the ports (208a, 208b); an actuator configured to move the movable member within the valve chamber along the axis, so as to vary the fluid pressure at each of the fluid receiving ports (208a, 208b) as aforesaid; a spool located within a spool cavity and between a first spool chamber and a second spool chamber, wherein the first spool chamber and the second spool chamber are of varying volume based on the position of the spool within the spool cavity; a supply pressure inlet; and a supply line connecting the supply pressure inlet and the valve chamber; characterised in that each port (208a, 208b) is fluidly connected to a respective one of the first and second spool chambers (204a, 204b), such that, in use, when the actuator is actuated, the spool moves within the spool cavity to vary the volume of the first and second spool chambers (204a, 204b) in response to fluid pressure communicated from the ports (208a, 208b). a valve chamber; a pair of fluid receiving ports (208a, 208b); a movable member disposed between the pair of ports (208a, 208b) and movable within the valve chamber along an axis, wherein the movable member comprises a pair of openings (213a, 213b), each facing a respective one of the ports (208a, 208b) to permit fluid to flow from the valve chamber to the ports (208a, 208b) via the openings (213a, 213b) in use, wherein a fluid pressure at each of the ports (208a, 208b) is dependent upon an alignment of each of the openings (213a, 213b) with a respective one of the ports (208a, 208b), and movement of the movable member along the axis is configured to move the openings (213a, 213b) into and out of alignment with the ports (208a, 208b); an actuator configured to move the movable member within the valve chamber along the axis, so as to vary the fluid pressure at each of the fluid receiving ports (208a, 208b) as aforesaid; a spool located within a spool cavity and between a first spool chamber and a second spool chamber, wherein the first spool chamber and the second spool chamber are of varying volume based on the position of the spool within the spool cavity; a supply pressure inlet; and a supply line connecting the supply pressure inlet and the valve chamber; characterised in that each port (208a, 208b) is fluidly connected to a respective one of the first and second spool chambers (204a, 204b), such that, in use, when the actuator is actuated, the spool moves within the spool cavity to vary the volume of the first and second spool chambers (204a, 204b) in response to fluid pressure communicated from the ports (208a, 208b).