Can the police be sued for searching a vehicle without having reasonable suspicion in a case where the law requires reasonable suspicion? If so, under what tort would it fall under?
It would not be battery unless the police also laid their hands on the driver e.g. by searching them.
I don't think it would be false imprisonment as the Police have a general power to stop vehicles. It is also questionable whether a driver who's car is stopped by the police could be described as being "imprisoned" unless I suppose they try to walk off and the police stop them leaving.
Violation of article 8 (right to private life) of the HRA? Although I question whether a search of a car engages article 8.
Trespass to goods? Trespass to land? Is entering a car without the consent of the driver trespass, even if it is parked in a public place?
The scenario I was thinking is if the Police spot a car being driven by a known criminal and decide to pull it over and search the car on the off chance that they might find something incriminating.