1. Sealed with a loving kiss
During World War Two, letters between soldiers and their sweethearts were censored. Hundreds of thousands of couples wanted to keep their love alive in a time of great peril. Yet they could not write to each other without strangers reading every word.
In 1941 the government launched the airgraph system to help them stay in touch. Millions of letters were photographed and sent as rolls of microfilm then printed on arrival. But many couples were reluctant to reveal their true feelings in a format that would be read by censors. They needed to find other ways to express their love...
2. CLICKABLE: Uncover the hidden messages
In the 1930s lovers sent letters with SWALK or BOLTOP written on the envelope. These meant Sealed With A Loving Kiss and Better On Lips Than On Paper. In World War Two there was an explosion of saucy new acronyms. Can you decipher them?
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3. The language of stamps
Stamp positions had been used as a lovers' code since Victorian times in Britain. The stamp angle and placement on the envelope had a different meaning as the video below reveals.
The Language of Stamps (1940) British Pathe
4. To my dearest
How have lovers exchanged secret sexy messages over time?