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A fill cover assembly for a liquid fuel storage tank of a road tanker, the assembly comprising: a seat member having a frame, the frame defining a fill aperture, the frame being configured to be fixedly coupled to a base plate of a liquid storage tank, the base plate having a plate aperture formed t

A fill cover assembly for a liquid fuel storage tank of a road tanker, the assembly comprising: a seat member having a frame, the frame defining a fill aperture, the frame being configured to be fixedly coupled to a base plate of a liquid storage tank, the base plate having a plate aperture formed therein, thereby to form a fluid-tight seal between the seat member and the base plate around said plate aperture; and a fill-cover coupled to the tank and arranged to be moveable with respect to the frame between a closed condition in which a fluid-tight seal is formed between the fill-cover and the frame and an open condition in which fluid may be passed through said fill aperture to fill said storage tank, wherein the assembly is further arranged to allow venting of pressurized fluid from the liquid storage tank in the event that a pressure of the fluid exceeds a prescribed value.

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1. A fill cover assembly for a liquid fuel storage tank of a road tanker, the assembly comprising: a base plate;a seat member having a frame, the frame defining a fill aperture, the frame configured to be fixedly coupled to the base plate of a liquid storage tank, the base plate having a plate apert

1. A fill cover assembly for a liquid fuel storage tank of a road tanker, the assembly comprising: a base plate;a seat member having a frame, the frame defining a fill aperture, the frame configured to be fixedly coupled to the base plate of a liquid storage tank, the base plate having a plate aperture formed therein; anda fill-cover coupled to the frame and arranged to be moveable with respect to the frame between a closed condition and an open condition;wherein in the closed condition, a fluid tight seal is formed between the fill cover and the seat member whereby there is no venting of pressurized fluid from the liquid storage tank when a pressure of the fluid is below a prescribed value, and in the open condition, fluid may be passed through said fill aperture to fill said storage tank;wherein the frame of the seat member is in the form of an insert member having a flange portion with a peripheral face arranged to abut a portion of a face of the base plate around a periphery of the plate aperture and a lip portion arranged to project from the flange portion through the plate aperture;wherein the lip portion is configured to abut an edge of the wall member defining the plate aperture so that the flange portion forms a fluid tight seal between the seat member and the base plate of the liquid storage tank around said plate aperture;wherein the base plate is arranged to be coupled to a liquid storage tank having an access aperture formed therein and forms a fluid tight seal around the access aperture; andwherein the assembly is further arranged to allow venting of pressurized fluid from the liquid storage tank in the even that a pressure of the fluid exceeds said prescribed value when the fill cover is in a closed condition. 2. An assembly as claimed in claim 1, wherein the fill cover is movable with respect to the seat member thereby to allow venting to take place. 3. An assembly as claimed in claim 1, wherein the fill cover is a floating fill cover. 4. An assembly as claimed in claim 1 further comprising at least one resilient member arranged to urge the fill-cover against the seat member when the fill cover is in the closed condition, the assembly being arranged to allow the fill-cover to be displaced away from the seat member against an action of one of the at least one resilient members when the pressure in the storage tank exceeds the prescribed value. 5. An assembly as claimed in claim 1, wherein the lip is provided around substantially an entire circumference of the flange portion. 6. An assembly as claimed in claim 1, wherein the fill-cover is arranged to be hingedly movable with respect to the frame, the frame having at least one formation arranged to be hingedly coupled to said fill-cover. 7. An assembly as claimed in claim 1, wherein the seat member comprises a formation hingedly coupled to a lock member, the lock member being arranged to be coupled to the fill-cover when the fill-cover is in the closed condition thereby to prevent the fill-cover from assuming the open condition. 8. An assembly as claimed in claim 1, wherein the base plate is in the form of a generally planar member having a pair of opposed major faces, the base plate being configured to be coupled to the wall of a storage tank to form a fluid-tight seal with either of said major faces facing into said storage tank. 9. An assembly as claimed in claim 8, wherein the seat member is configured to be attachable to the base plate in one of a plurality of rotational orientations. 10. An assembly as claimed in claim 9, wherein the seat member is provided with a plurality of holes in said flange portion of the seat member, the holes being arranged to receive fixing elements thereby to fix said seat member to said base plate. 11. An assembly as claimed in claim 10, wherein said holes are tapped blind holes. 12. An assembly as claimed in claim 11, wherein said blind holes are provided with an opening at said peripheral face. 13. An assembly as claimed in claim 10, wherein a plurality of corresponding raised portions are provided on an opposite side of the seat member frame to the holes to provide an increased depth of said holes in said frame. 14. An assembly as claimed in claim 1, wherein the seat member is provided with a seal element arranged to provide the fluid-tight seal between the fill-cover and the frame. 15. An assembly as claimed in claim 14 further comprising a barrier member, the barrier member being arranged to prevent a free end of a fill arm from being lowered onto the seal member, the barrier member comprising a skirt member formed around at least a portion of the fill aperture. 16. An assembly as claimed in claim 15, wherein the skirt member is formed around substantially the entire circumference of the fill aperture. 17. An assembly as claimed in claim 15, wherein the skirt member is provided with at least one opening therein arranged to allow passage of fluid therethrough, said fluid being forced out from said fill aperture under pressure when said fill-cover is in the closed condition. 18. An assembly as claimed in claim 1, wherein the plate member has a diameter in the range from around 15 to around 25 inches (around 38.1 cm to around 63.5 cm). 19. An assembly as claimed in claim 18, wherein the plate member has a diameter of substantially 21 inches (53.3 cm). 20. An assembly as claimed in claim 1, wherein the fill-cover has a diameter in the range from around 5 inches to around 15 inches (around 12.7 cm to around 38.1 cm). 21. An assembly as claimed in claim 20, wherein the fill-cover has a diameter of substantially 10 inches (25.4 cm). 22. An assembly as claimed in claim 1, wherein the seat member is a cast member. 23. An assembly as claimed in claim 1 formed from aluminium. 24. An assembly as claimed in claim 1, wherein the seat member is arranged not to deform sufficiently to affect an integrity of a seal between the fill-cover and the seat member when a pressure in the storage tank rises to a around 126 psi and then falls back to atmospheric pressure. 25. An assembly as claimed in claim 1, wherein the seat member comprises an annular member. 26. A fluid storage tank comprising an assembly as claimed in claim 1. 27. A tank as claimed in claim 26 for containing a substance that is in substantially liquid form at standard temperature and pressure. 28. A tank as claimed in claim 26 containing a liquid fuel. 29. A tank as claimed in claim 26 containing at least one distillate being a mid or high distillate. 30. A road tanker comprising a fluid storage tank as claimed in claim 26. 31. An assembly as claimed in claim 1, wherein the fill aperture is adjacent to and fixedly coupled to the base plate.