I don't think there's any doubt about the size of the house you could buy with UK sized house sale proceeds in your back pocket!
We sold a vast house on the Sunshine Coast back in Jan this year- 1/3 acre, 4 bedrooms, study, utility, 2 big living rooms, a kitchen you could land a small aircraft in... drive in integral double garage, pool, shade house, patio, yadda, yadda for AU$565,000....(£292,000)
BUT thing is, you can GET such big houses towards the northern half of Oz cos you don't have to heat them! They ARE quite flimsy, too. This can be an issue when the neighbours around you are out in the summer evenings having a barbie- that goes on til 2am....but also they can be really quite cold for the 2 months of winter- I brought the DSs' fleece PJs back when we emigrated to the UK 6 years ago and have never unpacked them! But similarly they've barely worn the anti-skin cancer sunsuits or the selection of wide-brimmed hats, and we still have 2 litres of sunscreen left! The point I'm rather facetiously making is that though waking to The Sun every day is pleasant, it destroys young skin! We would go under shade by 10am at the latest and re-emerge at 4pm, giving us perhaps 2 hours in the morning and 1-2 hours in the evenings before it got too dark to enjoy the great outdoors!
We were also well in a position to afford private schooling but again, where we were, the options were ALL religious! Two Christian Fundamentalist colleges, a Catholic one, a Lutheran one, a Methodist one (recently taken over by the Methos when the previous owner/head-teacher had his past catch up with him re fiddling with under-aged girls...!!- not slanderous, but completely true!) and an Anglican one. Sport, sport, sport was the order of the day in each, to the extent that our very Lutheran neighbours who were both Lutheran teachers moved back to their Germanic-heritage homeland of the Adelaide Hills to get their DCs away from the 'No Worries', surfing dude attitude that even the privately educated DCs started to exhibit come Y10 and 11.
I have a friend who has just emigrated back from 4 years on the Gold Coast. She has had to have her 14 year old DS privately tutored to catch him up with the DCs in the school he left 4 years ago in Gloucestershire now they're back. He was on his state school's 'gifted' program in Oz. Thing is, I think a big issue re education is we here have OFSTED, league tables (not that I condone these particularly!) and the broadsheets ENDLESSLY bang on about standards in education. You don't have that to nearly the same extent in Oz. It's quite hard to measure how good a school is in many ways. Whilst obviously there are no doubt great schools in Oz, be aware that the snob value attached to many would make Eton blush!
Just some food for thought and of course, all my own opinion!