In the first instance you should make enquiries with your neighbours to locate the owner of the car, which may lead to the car being moved.
However, if the car is fully taxed, insured, isn't causing an obstruction and is not in breach of any parking restrictions, the police cannot take any action. A car can park on any road (restrictions permitting) for any length of time. However, if the car hasn't moved and has been there for a number of weeks, then it may have been abandoned - you can report abandoned vehicles via the link below:
