The organiser says:
We are converting to Gift Aid from January 13th 2017, and we would like to make as many visitors as possible aware of this. All UK tax payers can add Gift Aid to their donations, and this can be a huge benefit to the Palace.
Our Charity and Gift Aid:
As a registered charity your admission fee makes a big contribution to the amount of restoration and conservation we can achieve every year, securing the future of this World Heritage Site.
By agreeing to donate your Palace, Park and Gardens admission on arrival you can benefit from converting to a free Annual Pass*. To help us achieve even more we ask that you kindly agree to Gift Aid* your donation when you come to claim your Annual Pass, which makes your donation go even further.
*Terms & Conditions apply