The Legislation: Section 59 Police Reform Act 2002 states that -Where an officer has reasonable grounds for believing that a motor vehicle is being used in a manner which contravenes Road Traffic Act Section 3 (Careless Driving) OR Section 34 (Driving elsewhere than on a road) AND also the manner of use of the vehicle is causing or has been causing or is likely to cause, alarm distress or annoyance to members of the public, Section 59 can be used to:-initially give a written warning (valid for twelve months) (commonly called a Section 59 Notice) and on a subsequent occasion to seize the vehicle. (it will probably end up in the crusher, or may be ransomed back to the owner) A constable in uniform has the power to order the person driving to stop the vehicle, to seize and remove the vehicle, to enter any premises on which the officer has reasonable grounds for believing the motor vehicle to be and to use reasonable force. Seizure can made only if a warning has been given, or believed to have been given, or if a warning is clearly being ignored. So, usually it's a two-stage process -a warning or notice first, seizure if you persist or repeat.