There's nothing on my ticket email confirmation about that - mine says (quote)
'All sales are final. No refunds can be made unless the event is cancelled.
Tickets will be mailed, using registered post, two weeks prior to the show, earlier if possible. You will receive an email on the day of dispatch.
Tickets for the show in Milan will not be mailed but you will be asked to collect them from the venue box office on the day of the show.'
But thanks for the info anyway