This Edward VIII letter box is believed to be the only one in existence
http://en.wikipedia.org/wiki/File:E7R_Bawdsey.jpg
The listed buildings of Bawdsey are here
http://www.britishlistedbuildings.co.uk/england/suffolk/bawdsey
It is thought that somewhere in the Bawdsey area a Flame Fougasse [Foo Gas] station was built does anyone know of its proximity to Bawdsey Manor? http://en.wikipedia.org/wiki/Flame_fougasse
Some more information here on Bawdsey Quay
http://www.suffolktouristguide.com/Bawdsey-Quay.asp