I got a replacement board from Stellatech in Europe. [http://stellatech.com/article.php?id=820524|Part link]. It cost 7 Euro's plus postage and VAT.
I have just replaced the small board in the watch and its happily charging. Once I had taken the case apart (Thanks iFixit! [guide|23990|teardown link] ), I used a small spudger to pries the board of the base. [https://www.dropbox.com/s/v9a3z67kam5876d/Gear2Image.png?dl=0|See here for an image of where to prise from]
Its glued in (I assume to keep it water tight) and take a bit of effort to remove. Pulling by the little Tab actually separated the board from its backing! I used a thin layer of contact cement on the base.
Lets see how it goes.