Can I alter my booking?
You can alter your booking online. Changes are possible up to six hours before your departure time.
To do this, log in to the site by entering your e-mail address and password and then go to the "My account" section and cancel the appropriate ticket(s).
The value of the ticket(s) will be credited to your personal account and deducted from the total due for your next booking, which you can make immediately after this cancellation and apply the changes you wish to make.