Migration flows between family practitioner areas of 1 in 300 people.

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 threshold is lowered London becomes linked to the south coast. The conurbations of Tyneside, Manchester, Liverpool, Leeds and Birmingham are starting to take shape, but most areas are not yet connected.

Second print from a series of six.