From Historic England:
“The Letter Box Study Group has identified 171 boxes surviving from the short 1936 reign of Edward VIII.”
“Edward VIII abdicated in December 1936 after only 11 months on the throne. Post boxes carrying his cipher are therefore rare. Greater London contains around two dozen. The closest to the centre can be found (see image) on The Highway in Shadwell. Look for the post box opposite the Texaco garage near Swedenborg Gardens.”
“Emanuel Swedenborg; born Emanuel Swedberg; 8 February [O.S. 29 January] 1688 – 29 March 1772) was a Swedish pluralistic-Christian theologian, scientist, philosopher and mystic. He became best known for his book on the afterlife, Heaven and Hell (1758). Swedenborg had a prolific career as an inventor and scientist.
He was buried in the Swedish Church in Princes Square in Shadwell, London. On the 140th anniversary of his death, in 1912/1913, his remains were transferred to Uppsala Cathedral in Sweden, where they now rest close to the grave of the botanist Carl Linnaeus. In 1917, the Swedish Church in Shadwell was demolished, and the Swedish community that had grown around the parish moved to Marylebone. In 1938, Princes Square was redeveloped, and in his honor the local road was renamed Swedenborg Gardens. In 1997, a garden, play area and memorial, near the road, were created in his memory.”