I paid 17 pounds sterling in June of last year. I don't remember if it was a separate charge after the kickstarter or was all at the same time. It was all handled in the backer kit of the pledge manager though. Did you ever get an email survey from the backer kit?
https://uboot-the-board-game.backerkit.com
In that survey you should be able to enter your shipping address and i assume pay for the shipping