However, there are times when vehicles without permits ignore the rules.
If that's the case you can report them by visiting the enforcement service at: http://www.reading.gov.uk/parking
Click on "Report an illegally parked vehicle" and then you can either log on or "continue without an account".
You will be asked for details of the vehicle, registration number, colour, location. The reports are sent directly to the Civil Enforcement Officer base for them to review and action. If there is a CEO in the area, they can be directed to the road ASAP.
Let us know how you get on.