Hi Paul,
I'm afraid that there isn't a simple yes or no answer to your question as it really depends on a number of factors.
When travelling from the UK, you have two options:-
1/ Purchase Disney's Premium or Ultimate tickets from the UK version of the Walt Disney World website
HERE
2/ Purchase Magic Your Way Base tickets from the USA version of the Walt Disney World website
HERE
As to which is more economical, it really depends on how many days you
are planning to visit the Disney theme parks, if you will also be
visiting the Disney water parks & DisneyQuest, whether you want
the flexibility of being able to park hop during your visit and the current exchange rate.
I would recommend that you price each option up separately and see which works out the cheapest. If you want to ask me another question which is more specific, I would be happy to assist you further.
To help you with planning your trip, I would recommend that you visit the
My Holiday Planner
website where you can watch a number of videos including my top tips
which are aimed specifically at helping UK Guests plan their trips to
Walt Disney World.
You will also be able to order a copy of the Little Big Book of Magic
guidebook which contains pull out maps and insider tips to help you get
the most from your trip as well as a Walt Disney Travel Company brochure
and some other planning tools.
Wishing you a magical holiday filled with memories which will last a lifetime!