Your card is charged as soon as you make the booking. It can sometimes take a few days for the money to be claimed though, so it might not show up on your statement straight away. Don't worry because once the booking has been authorised the money is earmarked so that when we are ready to take the money, it won't be spent.
If you're not sure if a booking's gone through, you can always check the order history in your online account. As always, feel free to get in touch if there’s anything you're not sure about.