Great job there Patrick, I need to start on mine soon. Don't give up on UK birch bark folks, there is some good stuff to be had. Take a look in your local woods at trees that have come down recently. I've found some good thick stuff this way. Don't take it off of the live trees though, apart from the danger of ringing the tree and killing it, you will also set a prescedent that will be followed by the chavs.