A pre-authorisation is not a charge, but a temporary hold. This hold is applied at the time of booking your trip, to verify your card, and no money is taken from your account at this stage. The funds being held will be released within a short period of time after the trip has been cancelled or completed.
If you have any further questions please check out our pre-authorisation/pending transaction FAQs or contact our Passenger Care Team directly. They'll be happy to help!