I am one of those who have done it for my kids, the mainreason being the way the UK as detariated over the last decade, there are so many children with zero respect for adults, other children and property, gangs just hanging around street corners causing trouble (having a laugh because there's nothing else to do ??), the knife culture, in short to many kids are being dragged up rather than brought up.
I feel to many children grow up too fast in the UK and don't have/enjoy a real childhood.
Here in Oz I feel my children will have a better start to life, the children here have respect, can hold conversations with you and are generally more confident in the right sort of ways, the outdoor life is an added bonus.
When the time comes if they want to return/travel to the UK so be it, but when that time comes hopefully they will travel as confident, respectful young adults,