Would open prisons work in Australia?
Australia actually go the other way. There are prisons in Australia where every single inmate is kept in solitary confinement. You can't do that in the UK because it is considered cruel and unusual punishment. The incarceration rate is significantly higher in Australia than the UK and whereas the UK have spare capacity, Australian prisons are completely full. Lots of criminals in Australia are given suspended sentences simply because there is nowhere to put them.
Open prisons are a cheap and effective way of increasing prison capacity but do you think Australian criminals can be trusted?