I cannot recommend highly enough that you go and have a look at the poster work of Tom Eckersley(from Bolton) in the Eckersley Archive. I had heard of Eckersley's poster work as a foundation student and I looked up the design work he did with Eric Lombers as Eckersley-Lombers when I was a student.
I think I probably dismissed it at the time as a bit old fashioned and simplistic - now however...
So many beautifully designed images, often advertising pretty mundane subjects with absolute clarity - its a joy! And I do even remember seeing some of those Post Office posters as a kid.
Click on the title link and have a look!