Ah sorry, I was mixing things up. Requiring production, distribution, and retail to be separate sounds like a good starting point.

Yeah its the integration of all of that which is really allowing the cartel to dominate both the buying and selling side of things which in effect has made them a monopsony. (I learnt about the term a year or so ago reading Cory Doctorow, the technical definition would be a single buyer, but given how in concert the two Supermarket chains act (like Petrol retailers!) it seems to fit: https://www.investopedia.com/terms/m/monopsony.asp)

I think you’re right, the government would step carefully, but I’d guess the only reason for this is because the supermarkets will try to sway public opinion. Move too slowly, and you’ll have a change of government that may reverse it all.

I think this is what frustrates me most about the last Labour government, they effectively ceded power to the lobbies that back their opposition by not acting decisively enough to quickly embed their good ideas. There's a reason NActional Fist have rammed through as much change as possible in their first year and its to get as much of the pain done well before the next election and to make it hard to reverse. Labour had a real mandate, and chose not to use it, this lot claim a mandate that barely exists and use it to its fullest.

That definitely sounds like a mature society but I don’t think we are mature enough to head that way, considering the slide back towards companies running prisons and education.

Western Liberal Democracies are always in a pendulum of pseudo-revolution then reaction, but because the revolution side never goes far enough here (and you can see the same in the UK, USA etc) slowly we slide further and further to the right, particularly economically. Then eventually there's less bulwark against populism and the risk of something far-right socially/culturally emerges too.