Blind Alley opened to positive reviews, and was later adapted to the cinema in Tread Softly Stranger, released in 1958, and starring Diana Dors and George Baker.
Unpublished plays include Boomerang (Premiered Sheffield, England 1964), How do you spell Mississippi?
Popplewell published over 40 songs, recorded by, amongst others, Vera Lynn, Gracie Fields, Bing Crosby, Geraldo, Anne Shelton with Ambrose (bandleader) and his Orchestra, and Beniamino Gigli.
It has also been translated into Low German for Hamburg's Ohnsorg Theater, where Popplewell's play How Do You Spell Mississippi?
[3][4] Television versions of other stage plays by Popplewell have been broadcast in Germany, France, Belgium, Austria, Hungary and Russia.