After the German invasion of Poland, The King declared war in September 1939.
In preparation for war, Britain undertakes measures including calling up of troops, citizens returning home from abroad, children rehearsing safety drills. The government also thought of all the possible dangers and difficulties the Home Front would face and started to take precautions.
Take a look at life in Britain in 1939 through these fascinating black and white photographs taken by Gerry Cranham: