Thanks, this is helpful as it's something I hadn't considered. I joined a long time ago and can't remember which site I registered on, but given what you've pointed out I assume I must've done so on the US one. I did some research on this and looks like I have to phone eBay to change my country of registration according to this:

https://community.ebay.com/t5/Archive-My-Account-Q-A/Change-my-account-s-country-registration/qaq-p/...

That post is from 5 years ago, but it may still work like that. 

Thank you!