There is a couple of park and rides on your side of the city, if you get onto the southern bypass, then turn either way, (depends where you come from to which is closest) there is one at Thickthorn service station, and one by the Broadlands Business park, the busses drop off in the city centre main bus station, from there it would be a 15 minute bock to the train station (if you can follow my directions!) or you can get the number 25 bus from the station to the train station, nice and easy!