This is Fairfield Road Montpelier. All around cars are parked on pavements, over corners. But the only one penalized is the one whose tax disk is out of date. It is clamped, a nice visual deterrent to anyone who was thinking of saving 180+ pounds/year by, say, printing out a tax disk on their home printer. With the number plate reading vans driving around, checking every car registration number against the database, you will get caught (they say)
While clamping untaxed cars serves as warning message, what message does ignoring all other vehicle parking issues in the area say? It says: all we care about is your cash.