My planned trip to Dublin and the UK, will have me flying into Dublin, then sail/rail to Telford; Telford to York; York to London; then London back to Dublin.
It appears it will be best to book my tickets through Virgin Train's website. Seems I can get all the tickets I need for each leg of the itinerary and have the tickets emailed to print at home.
But, my lack of full understanding of the UK's National Rail, and each of the rail companies and carriers and their relationships still leaves me with some doubt. Any help or reassurance would be appreciated.