Clamping the car will mean that they do not get their car back until it is paid for and that you can tow the car away and destroy it so long as there is signage there to say so. Moat residencies hope that this will not happen to them and do not have any but as parking gets harder, so will the problems. Going back to the original post though, however supportive I may be of parking companies, I really do have an aversion to the camera ones and then a letter coming through the door. I think this is an absolute invasion of privacy as sometimes things are sensitive and someone is perhaps somewhere a member of the household should not be. That is a matter for them but there just seems something wrong to me about the photagraphic thing. At least with a ticket on the window, the person knows it is there but with a letter two weeks later, it just does not seem right to me somehow.