©George Rodger / Magnum Photos
GB. London. World War II. 1940. Life in London during The Blitz of World War II in 1939-40. G.B. ENGLAND. London. Steel helmets were worn by all who could get them. Life in London during The Blitz of World War II in1939-40. 1940.
Photographs from Life Magazine & Getty Images -- available on the Google Cultural Institute site
Photographs of World War II London during the Blitz-- from the ArtSTOR database
The Blitz in pictures - from BBC News