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When I grew up in 1940s and 1950s Britain, people letters and postcards were the main way that people kept in touch with each other. As the volume of mail (which we called 'post') was relatively large, there were two deliveries each weekday: the 'first post' and the 'second post'. There was one delivery on Saturdays and none on Sundays.
The number of deliveries, though, was in stark contrast to the deliveries in the early 1900s when my mother was a child. Then it was quite normal to post a letter in the morning and get a reply that same evening. The last delivery (the fourth of the day, known as the 'last post') could be as late as 9.30 at night.
My mother describes the postmen's uniform in the early 1900s, but when I was a child in the 1940s and 1950s, postmen always wore dark navy uniforms with peaked hats rather like those of bus conductors.