The address was written on a hand-painted address panel - how beautiful!
Inside was a carefully wrapped green tissue packet with a note on the front. The note was written on the back of more art work.
It contained a set of stamps with a brief history of post boxes.
In case the photographs cannot be enlarged this is what is printed above the post boxes:-
'The earliest known surviving posting slot was placed in the wall of Wakefield Post Office in 1809. Britain's first roadside pillar boxes appeared in the early 1850s but, in more remote and less populated areas, a cheaper and more practical alternative was needed, resulting in the development of smaller post boxes. Initially, they were installed in walls, buildings or brick pillars; later designs were also attached to lamp posts.'