I felt the need to respond to the comment from Mark Carr (Apology needed; SN, 06/07/2018)
I lived in Shetland for six years (from April 2008 to May 2014) and can definitely recall regularly seeing many discarded beer cans, lager bottles and fag packets etc alongside the roads and lanes on the Shetland mainland.
I was a regular walker and runner during my time in the islands and saw such items in great number close up. My eyesight was fairly good back then.
There would be no need for roadside Dunna Chuck Bruck campaigns and Voar Redd Ups if there were just wild flowers in the verges.