The theme for today in Sunday Stamps II is Ports and Harbours. So I am not sure this stamp will fit...
It was issued on July 20, 1993 (but I received it on a postcard some weeks ago), and belongs to a set of four dedicated to the bicentenary of the
Canal mania that reached his height in England in 1793, when the Parliament passed 24 acts authorizing a new canals to be built (while 38 more were in the works). This one shows the Stainforth and Keadby Canal, today called the
Sheffield and South Yorkshire Navigation.
Probably the following British stamps will appear today in
Sunday Stamps. But, just in case, let me show
again some stamps of the set
Seaside Architecture, issued by
Royal Mail on 18th September, 2014. This set is a very favourite!