Flows between 1975 and 1976 drawn between the 97 areas from the national information system, on an equal population cartogram — software by author on an Archimedes computer.
As the level is lowered to a fifth of one percent, only six areas are not yet connected (including Scotland, Northern Ireland and the Isle of Mann). The most interesting feature is the divide along the Pennines running down the centre of the country, separating contiguous regions from one another. The North West is still not connected to the rest of the country, neither is Wales, while the lines are beginning to cross over each other inside London.
Third print from a series of six.