Changes only possible to a different train on the date of travel for 10 euro
Further complicated by wishing to cancel the outbound leg, as taking the return leg implies the outbound was taken, no refund possible.
If you have not already collected the ticket, call the number on the booking confirmation email during working hours
Most likely only option is to book a new ticket for the outbound leg.
Bear in mind you will need to collect the ticket already purchased before 2100 on Friday (any station will do)
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