I think Gloucester's probably the nearest railway station with a direct train line to / from London (trains leave from London Paddington).
There are buses from Gloucester to Ross-on-Wye - if you go to the Stagecoach website http://www.stagecoachbus.com/ you should be able to find out what numbers, how long, etc. I think it's 45 minutes - 1 hr.
Hereford train station is probably slightly nearer than Gloucs but the distance is so close it would make sense to choose the best route depending on the date / times of your travel
Have a look at www.herefordbus.info - you can use this to plan a journey from / to anywhere in the UK provided the journey starts / ends in Herefordshire. It gives you the option to plan a route either by bus or train or a combination.
Hope you have a lovely time
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