More to explore:
WWII Air Raid Drill in The National Children's Home
by theirhistory on Flickr
English children waiting out an air raid. England 1940.
Air raid shelter
Air raid shelter beds, 1940
Christmas in an air raid shelter, 1940
Air raid shelter in north London, 1940 ~
Civilians in an air raid shelter in London 
WW2 Air Raid Warden's Shelter
London Transport, 1940
Christmas in an air raid shelter ~
A postman emptying the pillar box the morning after a bombing raid in London. 1940-41.
24 Oct 1940, England, UK --- A woman wears a surgical mask to protect others from her cold in a British air raid shelter during World War II ~
Cupboard air raid shelter at a day nursery in the East End of London