This is dependent on the specific transport operator you’ve booked with and will also depend on the ticket type you have purchased.
For example, many advance purchase tickets don’t allow for any changes or refunds. If refunds and changes are possible with your ticket, the fee imposed by the rail or bus operator can sometimes be more than the ticket itself.
Please read the conditions of your ticket, if you are still unsure, send us an email to the one of the following:
Existing UK & USA train tickets: firstname.lastname@example.org
Existing flight bookings: email@example.com