I've posted before with a piece from BluLima, but never an exclusive post about these great prints. A little history about the phrases and designing on these:
In the Spring of 1939, with war against Germany all but inevitable, the British Government's Ministry of Information commissioned a series of propaganda posters to be distributed throughout the country at the onset of hostilities. It was feared that in the early months of the war Britain would be subjected to gas attacks, heavy bombing raids and even invasion. The posters were intended to offer the public reassurance in the dark days which lay ahead.
The posters were required to be uniform in style and were to feature a 'special and handsome' typeface making them difficult for the enemy to counterfeit. The intent of the poster was to convey a message from the King to his people, to assure them that 'all necessary measures to defend the nation were being taken', and to stress an 'attitude of mind' rather than a specific aim. On the eve of a war which Britain was ill-equipped to fight, it was not possible to know what the nation's future aims and objectives would be.
At the end of August 1939 three designs went into production with an overall print budget of 20,600 pounds for five million posters. The first poster, of which over a million were printed, carried a slogan suggested by a civil servant named Waterfield. Using the crowns of George VI as the only graphic device, the stark red and white poster read 'Your Courage, Your Cheerfulness, Your Resolution will Bring Us Victory'. A similar poster, of which around 600,000 were issued, carried the slogan 'Freedom is in Peril'. But the third design, of which over 2.5 million posters were printed, simply read 'Keep Calm and Carry On'. The first two designs were distributed in September 1939 and immediately began to appear in shop windows, on railway platforms, and on advertising hoardings up and down the country. But the 'Keep Calm' posters were held in reserve, intended for use only in times of crisis or invasion.