Hi Jason!
Thanks for sending your question from across the pond! Here at the planDisney Panel, we love helping Guests like you plan the perfect vacation! To answer your question, yes, you can change the park reservation dates, (subject to park availability of course). You can cancel park reservations and book new ones based on park availability for your type of ticket. Different types of admission—such as tickets, Annual Passes or packages—may have different reservation date availability. If you have not purchased tickets, it is recommended that before you make a purchase, check to see if your desired date and theme park is currently available. You can view park availability by visiting this site:
Theme Park Reservation Availability. Given the limited availability of park reservations, it is recommended that you make your theme park reservations immediately after purchasing your admission. If you decide to change dates, do so immediately as availability is limited.
Did you know? From time to time, the Walt Disney World Resort has special offers for rooms and park tickets. Be sure to check them out on this page:
Special Offers, Deals, and Discounts.
It has been a pleasure assisting you Jason! Please feel free to send me any other questions you may have!
Thanks again for sending your question to the planDisney Panel!
~Yael