That depends on the type of ticket you purchased.
eTickets - no need for you to do anything except fill out the automated refund form. You can then sit back and relax and your refund will appear within 5 days - how easy is that?
If you haven't yet collected your tickets from the machine - no need for you to collect them to get your refund. Just fill out the automated refund form and your refund will appear within 5 days.
If you have already collected your tickets from the machine - not to worry. Just post your tickets back to us at the address below by tracked delivery. Once we receive your ticket, we will process your refund within 5 working days.
Virgin Trains Ticketing Refunds
PO Box 1259
However you request a refund, the money will be refunded to the original account or card the tickets were purchased with. Your refund will be processed once any tickets have been received in 5-10 days, and your account will be credited minus any administration fee that is due (normally £10 per ticket)