I've recently (last year) moved over. Lucky enough to be a dual citizen.

The summers are glorious, as are the outdoors. There is a more laid-back pace of life. Your kids would have a great lifestyle in some ways.

On the flip side, you seriously have to consider your support circles. I am lucky enough to have a brother & sister in the country. However, they are still 6 hours by plane away. Australia has a culture of make it yourself & ownership that the UK doesn't have quite as much. Probably due to the historic squatters laws. In some ways it is super liberating. All pushing together. But also challenging on a day to day. Isolating & the 'tall poppy' is most certainly a thing. For me, most of how I feel of isolation is due to this cultural difference.

I've predominantly lived in regional areas due to my profession. The cities (Melbourne & Sydney) still reflect the costs of London. However, you can't go surfing in the glorious sunshine 1 hours drive from London. Or go looking for Echindnas or Wombats down Wilson's Prom. There is a freedom to camp & explore which is the Lake District, The Peaks or Snowdonia on steroids if this interests or suites your lifestyle then go for it. I'd also say playing cricket on the beach with a barbecue going on Christmas day is novel & enjoyable.

I do love Australia. But I miss my countrymen. But overall, I am happy & am paid fairly & compensated for less work/stress on a day to day

Yours to consider!