pretty tricky....if a resident that lives in the CPZ doesn't want to spend money on the permit or against it, or with no money for that. it Will for sure park few roads away in some parking free zone street. Basically the area where is free zone will be assaulted by many extra vehicles looking for the free parking. As consequence the residents will complain...Hence soon the Council has white paper to declare all East Dulwich CPZ, as such imposing charges to everybody. Simple as that ...cleverly masterminded...