There is one major flaw in the argument that prison cannot be an available sanction: all other forms of penalty, including "community and transformative justice" require the co-operation of the criminal. Everything from Conditional Discharges, through fines and community orders (which I suppose what is imagined when "community and transformative justice" is mentioned) requires those sentenced to comply with the penalty. People fined must pay their dues; those sentenced to a community order must turn up when and where they are directed. So what happens when they refuse to comply with their "community and transformative justice" sentence. Do the authorities say "OK then. We've nothing else available with which to punish you, so we'll call it a day"? Or do they do something else? And if so, what exactly, since all the prisons have been closed?