A linear hydraulic damping device comprising: a damper body defining a first chamber having a first fluid inlet and a second chamber having a second fluid inlet; the first and second chambers (74, 76) separated by a wall; the wall having at least one first passage and at least one second passage connecting the first chamber and the second chamber, the first passage having a first end opening into the first chamber and a second end opening into the second chamber and the second passage having a first end opening into the second chamber and a second end opening into the first chamber; a first movable element received within the first chamber, and resiliently biased by a first spring towards the wall to a closed position wherein the first movable element closes the first end of the first passage but does not close the second end of the second passage; a second movable element received within the second chamber and resiliently biased by a second spring towards the wall to a closed position wherein the second movable element closes the first end of the second passage but does not close the second end of the first passage; the first moveable element being movable from its closed position against the force of the first spring by entry of fluid into the second chamber and into the second end of the first passage, and the second movable element being movable from its closed position against the force of the second spring by entry of fluid into the first chamber and into the second end of the second passage; wherein the respective first and second movable elements (120, 122) are poppets; wherein each movable element (120, 122) comprises a head portion for engagement with the respective passage ends (90...96), and a body portion slidably received within the respective first and second chambers (74, 76); the movement of the first movable element away from the wall creates a first, variable damping orifice between the first end of the first passage and the first movable element; and the movement of the second movable element away from the wall creates a second, variable damping orifice between the first end of the second passage and the second movable element; wherein the respective biasing springs (130, 132) are mounted to the damper body such as to exert a variable force on the respective movable valve elements; characterised in that the end of the respective biasing spring (130, 132) opposite the respective movable element (120, 122) engages a movable seat, wherein the seat is provided on a member (140, 142) threadably received in the damper body. a damper body defining a first chamber having a first fluid inlet and a second chamber having a second fluid inlet; the first and second chambers (74, 76) separated by a wall; the wall having at least one first passage and at least one second passage connecting the first chamber and the second chamber, the first passage having a first end opening into the first chamber and a second end opening into the second chamber and the second passage having a first end opening into the second chamber and a second end opening into the first chamber; a first movable element received within the first chamber, and resiliently biased by a first spring towards the wall to a closed position wherein the first movable element closes the first end of the first passage but does not close the second end of the second passage; a second movable element received within the second chamber and resiliently biased by a second spring towards the wall to a closed position wherein the second movable element closes the first end of the second passage but does not close the second end of the first passage; the first moveable element being movable from its closed position against the force of the first spring by entry of fluid into the second chamber and into the second end of the first passage, and the second movable element being movable from its closed position against the force of the second spring by entry of fluid into the first chamber and into the second end of the second passage; wherein the respective first and second movable elements (120, 122) are poppets; wherein each movable element (120, 122) comprises a head portion for engagement with the respective passage ends (90...96), and a body portion slidably received within the respective first and second chambers (74, 76); the movement of the first movable element away from the wall creates a first, variable damping orifice between the first end of the first passage and the first movable element; and the movement of the second movable element away from the wall creates a second, variable damping orifice between the first end of the second passage and the second movable element; wherein the respective biasing springs (130, 132) are mounted to the damper body such as to exert a variable force on the respective movable valve elements; characterised in that the end of the respective biasing spring (130, 132) opposite the respective movable element (120, 122) engages a movable seat, wherein the seat is provided on a member (140, 142) threadably received in the damper body.