Only appears for Kindles registered with amazon.com

I’ve tried this on our blog – but when I provide the details of my Kindle (which is registered with amazon.co.uk) the response is that I have no Kindle registered.
I’m guessing that the code only queries for Kindles registered with amazon.com?
If so this is something I would like to see you fix as quickly as possible; without international support it’s pretty much useless for us and I can’t use it.

Be great to get some insight from you re: when you might be able to support International users.

http://wordpress.org/extend/plugins/send-to-kindle/