Civilian Air Raid Precautions (ARP) wardens were deployed to ensure that blackout rules were followed. These wardens patrolled at night and took action against any building or vehicle with visible ...

During the ARP practice, sirens would sound the “alert” and the “all clear”, and during the “alert” period, a “total blackout” was enforced by the local authorities.

The key reason for maintaining blackout in the rural areas, particularly in the north, Roodhouse explained, was to make it harder for German pilots to navigate to their targets.