I am buying an ebook, so no ebay or shipping. They don't verify the address with the bank but I didn't wanted to put a fake address in case they send a receipt or something (our Turkish ebookstore sends paper receipts). Borderlinx works fine: a free UK address I can use all I like.
Waterstone's checked my IP. This free VPN solved it:
http://www.securitykiss.com/sk/index.php
I bought Chris Wooding's The Braided Path series, I wonder they are only available in Waterstone's and WHSmith.