You can do this at over 1000 machines at mainline railway stations across Britain.
Ticketing websites will help you choose to collect your tickets at a station that’s convenient to you. (You may have to select this station in advance). Most mainline stations in towns and cities now have ticket machines, but some rural and suburban stations do not. It’s best to check before you travel.
When you reach the station and find a ticket machine, you’ll need to enter the reference number you were given when you made your booking, so remember to print your confirmation and bring it with you. This will enable the ticket machine to find your booking on the reservation system and print your tickets. You will also need the credit card you purchased the ticket with online, if that card has expired or is lost, you need to contact customer services to arrange collection.