Ok so it seems I made a bit of an inexperienced error when setting up the shipping options. By default on some products Kickstarter may want you to add £20 to shipping if you are based overseas. This is correct if you are in North America, but if you are in Europe it should be a little cheaper at £10. I think one solution is to select UK shipping and then add the extra £10 manually. For those who live outside Europe and North America, you will have to make it an additional £35 on top of the product cost.
Whatever happens we'll be able to fix it afterwards by sending address updates and even partial refunds on shipping costs if necessary.