Can I join if I have an eBay account in the UK or can I join using my USA account but snipe items on eBay UK?

Hello Cal,
Thank you for your question about eBay UK. Yes, you can join with your USA account and snipe items on eBay UK. This is because all item numbers are unique across all of the eBay sites.
Thank you for taking the time to write in. Please let us know if you have any other questions. We are happy to help.