Hello Dan,
Depends, if you primary based (spend most of your time) and live in Japan, I say you give The Japanese Garrison a shout and join as one of them.
I am not sure about the UK and the AUS (because of the geographical reasons), but if you happened to drop by in Hong Kong for a while you are welcome to join us at events, and I think the same goes to the mates at Singapore too, they are a bunch of crazy welcoming people.