Advance tickets are the only type of ticket you can make changes to, and you can make changes up to 15 minutes before your original train is due to depart. If you chose to print your own tickets, you'll be able to make changes up until 18:00 the night before. Just so you know, we charge a maximum £10.00 fee per ticket, per person.
Follow our steps on how to change the time/date of your ticket here.
If you have a different ticket type, you might be able to cancel and get a refund. Read up on cancelling a booking here