Barter Books is a second-hand bookshop in the historic English market town of Alnwick, Northumberland, owned and run by Stuart and Mary Manley.
"[3] The bookshop is in the Victorian Alnwick railway station, designed by William Bell and opened in 1887.
In 2000 the owner discovered, in a box of old books bought at an auction,[7] a World War II poster from 1939 with the message "Keep Calm and Carry On".
The shop owners framed it and hung it up by the cash register; it attracted so much interest that Manley began to produce and sell copies.
[8][9] In late 2005, Guardian journalist Susie Steiner featured the replica posters as a Christmas gift suggestion, raising their profile still further.