HI Aimie and welcome to planDisney!
Unfortunately, it is not currently possible to purchase
Gift Cards here in the UK which can be used as payment towards
Walt Disney World Resort stays, park tickets etc.
In the past, it was possible to purchase gift cards from the UK Disney Stores however, these could only be used in UK Disney Stores and were not valid for use in the Disney Parks or anywhere else. That said, the sale of these was temporarily paused a good while ago.
If you are looking for ways to save some spending money towards a future trip, perhaps you could consider using a prepaid travel card or getting money changed into US dollars periodically to put away. This is something that I, myself, do to help with my family's budgeting and as the money is in US dollars, I'm not tempted to use it for anything else.
I hope that this has answered your question, Aimie. Please feel free to re-visit us here at planDisney if we can be of any further assistance. You can even
ask me a question directly if you'd like to.
Wishing you a magical holiday filled with memories which will last a lifetime!
Emma