SUSPENSION SEAT POST ASSEMBLY Field of the Invention This invention relates to a seat post assembly incorporating suspension that is particularly suited for seats of scooters, particularly ride on powered scooters, 5 Background of the Invention Suspension for a vehicle, such as a motorised scooter or cart, is important and necessary in order to provide a relatively smooth and comfortable ride for the person sitting on and using the motorised scooter. Typically suspension is provided in and around the wheel assemblies of the scooters which provides suspension for each of the 10 wheels when traversing uneven ground. However there is no support or comfort provided to the rider who contacts the scooter through the handlebars, in order to steer the scooter, and the seat itself. With existing seat post designs, when the rider experiences rough terrain, generally there is no comfort or smoothness to the ride and the rider has to withstand 15 various jolts and bumps going over such rough terrain. The present invention seeks to overcome one or the more above disadvantages by providing a seat post suspension assembly that provides a smoother and more enjoyable ride to the user of the vehicle. Summary of the Invention 20 According to an aspect of the invention, there is provided a seat post assembly for a vehicle for supporting a seat on which a user sits while operating the vehicle, the seat post assembly including: a tubular member; a resilient means securable to said tubular member which is deformable in 25 response to the vehicle traversing an uneven surface; 1 wherein said tubular member is attachable to said seat at one end thereof and said seat post assembly is attachable to a portion of said vehicle; said seat post assembly providing the user with comfort while operating the vehicle over the uneven surface. 5 The tubular member may include a head portion and a collar at said one end thereof, said collar including a series of projections that engage a portion of the seat to affix said seat post to said seat. The seat post assembly may include a further tubular member connectable to said portion of said vehicle and connectable to said tubular member through securing means. 10 One end of the resilient means preferably engages with a plunger and a plunger bushing, said securing means preferably being secured to said plunger to position one end of the resilient means in a portion of said tubular member, The tubular member preferably has a pair of apertures for receiving the securing means. The seat post assembly may further include an adjustment device for the resilient 15 means for adjusting the tension in the resilient means, The seat post may further include a bellows member adapted to fit around said tubular member, Brief Description of the Drawings Preferred embodiments of the invention will be hereinafter be described, by way of example of only, with reference to the drawings in which: 20 Figure 1 is a perspective view from above of a seat post assembly in accordance with one embodiment of the invention; Figure 2 is a perspective exploded view from above of the seat post assembly of Figure 1 showing all of the components of the seat post assembly; Figure 3 is a perspective view from above of a seat post assembly according to a 25 further embodiment of the present invention; 2 Figure 4 is a side view of the seat post assembly of Figure 3 having a bellows member attached; and Figure 5 is a side view of the seat pos t assembly of Figure 3 without the bellows member attached. 5 Detailed Description of the Preferred Embodiments Referring to Figures 1 and 2 there is shown seat post assembly (100) according to a first embodiment. The seat post assembly (100) includes a first tubular member (102), a resilient means in the form of a spring (114) and a second tubular member (118) which is adapted to fit within a portion of a vehicle frame, such as a scooter frame. The first 10 tubular member (102) engages a seat of a vehicle, such as a scooter, upon which a user sits in order to operate the scooter. The member (102) includes a head portion (108), a neck portion (110) and a body portion (112). The neck portion (110) is of a smaller diameter than each of the head (108) and body portions (112). A shoulder (111) joins the neck portion (110) to the body portion (112). Pitted around the neck portion (110) is a 15 collar (106). The collar (106) sits just below the head portion (108) which is essentially a circular flange. Located on the collar (106) are a series of projections or teeth (104) adapted for engagement with a plate that is attached to or forms the bottom part of the seat. An interference fit or engagement of the teeth (104) and corresponding portions in the plate enable the fitting of the first tubular member (102) to the seat together with a 20 pin (not shown) protruding from the seat plate that penetrates the top of the first tubular member (102). The spring (114) is adapted to fit within the lower part of the hollow body (112) of the first tubular member (102) and within the hollow second tubular member (118). The top of spring (114) is kept in place by a plunger (120) and a plunger bushing (128) 25 which fits between the plunger (120) and the top of spring (114). Furthermore, a second 3 bushing (130) fits over a boss (131) of a spring adjustment means (132). A preload bolt (134) fits through an aperture of the spring adjustment means (132), boss (131) and further bushing (130). The boss (131) and/or further bushing (130) may be threaded internally to co-operate with a thread of bolt (134) in order to increase or decrease the 5 tension in spring (114). The lower part of the spring (114) is kept in place by securing means (148), (150) in the form of screws which respectively protrude through apertures (149), (147) in the second tubular member (118). The screws (148), (150) respectively fit into apertures (151) and (153) in the spring adjustment means (132) to prevent the means (132) from spinning when adjusting the spring tension, 10 The plunger (120) has an aperture (121) through which securing means, partly in the form of a transverse bolt (122) fits, while the plunger (120) is positioned inside the hollow part of body portion (112). The bolt (122) also protrudes through apertures (123) and (125) of body portion (112). A corresponding washer (124) and nut (126) fits to the end of bolt (122) to complete the securing means. The bolt (122) therefore, through 15 plunger (120), affixes the spring (114) in a particular configuration within the body portion (112). The bolt (122), and corresponding washer (124) and nut (126) fit within apertures (142, 140) of the second tubular member (118). Each of the apertures (142, 140) are elongate and therefore adjustment of the position of bolt (122) can be made to adjust the relative distance between the first tubular member (102) and second tubular 20 member (118). A bellows member (116), being a soft flexible member, is adapted to fit over pal of body portion (112), bolt (122), nut (126) and second tubular member (118) as seen in Figure 1. First and second protuberances (136, 138) are respectively designed to fit over the nut (126) and head of bolt (122). The bellows member (116) adds protection to the 25 user from the hard metal surfaces of the various components, such as the head of bolt 4 (122) and nut (126), and also provides weather protection to parts of the seat post assembly (100). Once assembled, as is seen in Figure 1, the seat post assembly (100) can be inserted into a corresponding tube (not shown) or another portion attached to the scooter 5 frame. Adjustment of the correct seat height can be made through apertures (152, 154) of the second tubular member (118) through which protrudes a corresponding bolt and nut or other fastening device. Referring to Figures 3, 4 and 5 there is shown an alternative seat post assembly (300). The assembly (300) includes a hollow tubular member (302) which includes a io head portion (308), first portion (312) and second portion (310) having a slightly smaller diameter than first portion (312). Between the head flange portion (308) and the first portion (312) is a collar (306) having a series of projections or teeth (304) that function and engage a seat plate similar to the embodiment described in Figure 1 when connecting to a seat. Similarly, a pin protruding from the seat plate can penetrate the top of the 15 tubular member (302). A sleeve or bushing (314) fits over second portion (310) and is connected to tubular member (302) via a bolt (324) and corresponding washer (326) and nut (328). The bushing (314) provides a bearing or sliding surface between second portion (310) and an optional lower seat post of the assembly (300). Thus two tubular members (302) and another indicated by (311) can be affixed to one another by preload 20 bolt (324) and nut (328) with the bushing (314) fitting over the two tubular members. Connected at the bottom of portion (310) is a resilient means, in the form of a spring (322), connected through a seat post guide (318) to the top of spring (322). At the bottom of the spring (322) there is a spring block or base (320) in which the spring (322) is mounted, 5 A bellows member (330) is able to fit around the majority of tubular member (302) that is kept in place by a pair of fastening means (332, 334) in the form of plastic ties, This provides added protection to a user and protects components from the weather, The height of the assembly (300) can be adjusted through a pair of apertures 5 located in assembly (300) (not shown) and separated by a suitable distance, such as one inch. The assembly (300) can be secured at the new height to the vehicle frame by suitable fasteners. In order to provide a higher ride position to the user, bushing (338) is inserted into the assembly (300) to increase the height. Optionally casing (340) and additional 10 resilient means, in the form of spring (336), can be included in the assembly (300). 6