Edward VIII post box

I am partial to posting photos of post boxes and when I displayed  a Deconstructed Post Box two days ago, I was challenged by BlackTulip to find two rare Edward VIII boxes.

King Edward VIII reigned for only 326 days before his abdication on 11 December 1936.
As a result there were very few Royal Mail post boxes with his insignia on them, and even fewer are still in existence.

There are two in this area, one of which is shown.
The second awaits me....