Another good thread with lots of interesting points from which have learned. I do wonder however if the people who rule us have forgotten that Britain is an Island with a fixed acreage from which to produce food.
Those who relied on the Merchant Navy for our food, will remember that Britain couldn't feed a population of some 40 millions by organic farming in the nineteen forties. How then will it be possible to feed 60+ millions by similar methods today? Improvements in the effectiveness of modern organic farming over the 1940 methods have been largely lost, because the increase in population means that less land is now available for agriculture and horticulture.
Further Increases in population with all the facilities needed, will further reduce the area of land from which to produce organic food, and it would be unwise for anyone to imagine that the increases in productivity that came about as a result of plant breeding and farming methods since the war, are likely to be repeated were we to turn our creative minds to organic production.
I do not know the precise figures but there will be a ratio between the quantity of organic product grown in the UK and the increased quantity of conventional product which will need to be imported to compensate for the difference between the two systems.
In short. The greater the quantity of organic product we grow the more conventional product we shall need to import.
To turn from the subject of capacity to that of Food Miles, I believe that there are logistical local benefits to be had, but that improvements in local logistics will not result in reduction of imports.