A taxi driver was arrested following a series of taxi licensing checks in Aylesbury town centre yesterday.
The driver of the private hire vehicle was taken into custody after he failed to provide a private hire driver licence.
Five vehicles were stopped during the operation and four drivers were issued with warnings.
The cautions were given for not wearing their private hire driver badge and having an expired first aid kit while one vehicle was displaying an expired private hire vehicle licence plate.
The new plate was later found in his boot.
The checks were jointly carried out by the Aylesbury town centre neighbourhood policing team along with officers from the licensing department of Aylesbury Vale District Council.