1.   An unmarked car with John Law written all over it joined the black-and-whites.

2.   Hard-nosed policemen in unmarked cars belonged to a world of violence and intimidation he had no wish to enter.

3.   It was an unmarked car and it now carried the three of them towards Pushkin.

4.   The royal couple arrived unseen in an unmarked car.

5.   No mourners followed but an unmarked car appeared in the road and made it impossible for any vehicle to tail the hearse.

6.   It happened after police in an unmarked car had been following a stolen Maestro for several minutes.

7.   They were caught on camera by amazed police officers in an unmarked car.