What happens if I (or my kids) change my mind on an activity booking that has used a VAT credit, can I move this to another session for that activity or a different activity?

If guests need to edit an activity booking which includes use of a credit, then the complete value of that individual activity can be transferred to a new booking. However, if the new activity booked is of greater value, then the extra charge will apply, and is payable by the guest. If it is of less value, there will be no refund or additional credit assigned to the guest.