It is really quite simple
No one owns the land, no one made the land.
So instead we divy up the country into equal comparable portions:
There are 60 million in the UK.
245,000 sq kilometers
245,000 / 60,000,000 = 0.004083
There are 1 million square meters in a square kilometer so,
so 4083 square meters per person.
So if you need to visual that space it is 100 meters long by 40 meters deep.
If you have less than that you are being stolen from, if you have more you are being greedy :) Of course we would have to adjust for arable land and water supply perhaps (though there are wells).
Now, most won't need 4083 square meters, so they can rent out a portion of their land to business, or road works, charge a toll perhaps. That solves unemployment and allows those who wish to work in business the space to do it.
No one can buy or sell land, but they can exchange it or for another plot, and make rental agreement of 2 years maximum. This will create a constant rebuild for business, which will spur the economy. All business is run electronically, and all methods of production are done underground using cybernetics. Everyone grows their own crops using grow chambers and their plot of land. All wahrehousing is done in the vertical. There is no military or police just a standing army of land owners.
Yes, that is how all of this works, but of course we have some greedy power mongers who basically have just stolen from us, give us back our land.
And yes it will cause massive upheaval, but that will also spur the economy, as lots of things get torn down like the national trust places, and new things built.
Oh and you can only have 1/2 a child per person for a while, to increase the overall wealth, then it is 1 child per person max, no buying children slots :)