The War Illustrated, Volume 3, No. 46, Page 39, July 19, 1940.

No better tribute to the efficacy of the Anderson shelter could be desired than that given by these photographs of the erections after German aerial bombs had fallen close beside them. Three are on the very brink of bomb craters, and in no case did the enemy missile fall more than a few yards away. It will be noted that the corrugated steel walls and roof have been well covered and backed up with earth, in accordance with the official directions: the thickness should be 15 inches at the top and 30 inches at the sides. Another important point is to ensure that the entrance is shielded by a neighbouring brick wall, or by a baffle made of bags or boxes of earth or sand piled up high enough to protect the opening from blast or splinters. Only by attention to these points can the full security of the Anderson shelter be obtained.