Police have concluded they acted appropriately when they seized a UKIP vehicle protesting against HS2 in January.
Vale UKIP leader Chris Adams launched a complaint against police after the vehicle, being driven by an agency driver, was seized in Walton Court, Aylesbury.
It was the second time officers had stopped the vehicle that afternoon.
Police said in a statement: “The circumstances of the complaint were investigated and it was concluded the officer acted lawfully to stop the vehicle and the driver was found to be in possession of a revoked driving licence.
“As a result, the vehicle was seized.
“The person who lodged the complaint was kept fully informed as the investigation progressed and was provided with an explanation of the circumstances following the investigation.”