Not knowing what an Anderson Shelter I did some looking up.....
(Lear something new everyday around here
)
On 25 February 1939, the first Anderson shelter was erected in Britain in a garden in Islington, London.
Anderson shelters were half buried in the ground with earth heaped on top to protect people from bomb blasts during World War Two.
They were made from six corrugated iron sheets bolted together at the top, with steel plates at either end, and measured 6ft 6in by 4ft 6in (1.95m by 1.35m). The entrance was protected by a steel shield and an earthen blast wall.