I booked two Advance Standard Premium tickets to go from Euston to Stockport this Thursday then back to London from Preston on Friday. The reason for the trip had now gone. For Thursday’s ticket I have paid the £20 fee and rebooked them for two weeks time but I don’t have an obvious date to use the return tickets. So is there a way to park the tickets until I need them or should I just rebook them as far forward as I can and then change again when I know a date and absorb the extra £20 change of ticket fee?