The population is not large ... I'd guess about 20,000 in cities like Melbourne and Syndey.
But basically, when you look at factors like: English speaking, good climate, good lifestyle, has an established and understandable immigration program - the choices narrow down to Canada and Australia. And we do not like winter, so there you have it.
I think it changed a bit since 2001 - now, I think, UK has established a migration program similar to AU. Don't know all details, but I would consider it if it existed in 2001. One big negative side of Australia is that it is so far away from everything.
