As I'm already in Oz so I haven't seen this programme and can only take a guess that someone didn't like their new life here. I'm also guessing you all think this guy is crazy but until you've actually spent time in his shoes don't judge him.
I've been here almost 3 years, two of which we lived near Brisbane and the last 6 months down here near Adelaide and I'd move back home tomorrow if I could afford the removals and flight's. I am finding it very hard to settle here, our eldest daughter (now 20) and our youngest daughter (now 7) are also unhappy here, they miss their grandparents like you would not believe, our middle daughter (now 15) seems to have settled here but wouldn't be too heartbroken if we said we were returning to UK. We are planning to return to UK in two years after middle daughter (Tori on the kids section) graduates high school. We moved here for a better life for our kids but since arriving they've turned into couch potatoes, they say it's too hot to go outside and do all the stuff they used to enjoy doing, like riding their bikes, zooming up and down the street on their roller-blades or just enjoying playing on the swings at the park. We can't afford to give our kids half the stuff they had in the UK due to the high cost of living here, I find food shopping hard work as fresh food doesn't have a very long shelf life. Electricity and gas are more expensive than in UK too, winter electricity bills are real scarey due to houses having not central heating in them, so you need to buy heaters to warm the house which isn't easy as most homes are open plan.
Guess this makes me a whinging pom too.