827 NTC An MG A Roadster dating from 1960. This type of police vehicle was used for traffic policing duties, including on the new motorways. Notice the large black wailing siren mounted on the front.
A closer look at the illuminated police sign and amber warning light (a predecessor of the blue flashing light).
A look over the shoulder of the driver. It was normal practice to drive the car with the roof folded down so other motorists could see the police uniforms.
On the rear is an illuminated ‘police stop’ sign. The ‘stop’ part would be illuminated when requiring a motorist to pull over. This was done by first overtaking the target car, in contrast to today where stops are made from behind.