"There are virtually no areas of "common ground"."

There certainly are (from here):

There are around 373,570 hectares of registered common land in England (about 3% of the total land area). The term 'registered' means land registered under the Commons Registration Act 1965. In general terms, common land is land owned by one person over which another person is entitled to exercise rights of common (such as grazing animals or cutting bracken for livestock bedding), and these rights are generally exercisable in common with others.

3% is what we've got left. If these snake oil salesmen get their way then a fair wodge of that will go, and once it's gone we will never get it back.