Rosanna, I took a look here:
http://fuchsiafinder.com/find-...
There are 10 nurseries in the UK that are listed, but none currently has it. It might be worth your time and effort to send them each an e-mail asking if they might have them coming in this spring, and to please let you know. They may even offer to special order it for you.
The other alternative is to try to start a cutting if you know someone who has it.