I just can't get my head around going that far away to live that's all. (NZ and Australia.) Each to their own. Moving there (for good,) in the hope of better opportunities and a better life is one thing. But you are moving away from your entire life, and everything and everyone you know. Including lifelong friends, and family. It's a bit different for the poster above @twistie who says she didn't get on with family, and wanted to get away, but if you are close, I can't fathom why anyone would up sticks to the other side of the world, to live.
And is it better? I have heard from a number of sources, that people have moved to Australia or New Zealand for this 'better life,' and discovered it was not remotely what they expected. They felt lonely and isolated, 10,000 miles from home, their job wasn't what they expected, the people weren't as friendly as they were when they went there on holiday, and everything was super expensive. I have known a number of people going there (a couple to NZ, and half a dozen to Aus,) to stay for good, and they returned to the UK 3-6 years later. The grass isn't always greener and all that...
Also, there is a thread running right now, where someone can't seem to cope with travelling 5 hours to the other side of the country for their parents anniversary. So how on earth do family relationships continue when you're on the other side of the world? 
https://www.mumsnet.com/talk/am_i_being_unreasonable/5035399-to-not-go-to-parents-wedding-anniversary-do