You can change the card used to make payments by cancelling your upcoming bookings and rebooking them under the new preferred card.
To cancel your upcoming bookings, go to your bookings page and click ‘edit’ and ‘cancel’ next to the lessons you need to cancel. You can then rebook them by clicking 'book lessons' on the top right hand corner. You'll then be asked which card you would like to use for future bookings.
We don't store any card details on the site, and neither does our third party payment system SagePay. This means that you just need to make sure that there's no upcoming bookings in your account and you won't see any future charges.
Check out How does payment work? for more info on payments.