The Rover was a British boys' story magazine that ran from 1922 to 1973. It was one of a number of boys' magazines published by D. C. Thomson known as "Tuppenny Bloods" because of the two pence price of each issue. The Rover was also one of the "Big Five" boys' papers from Thomson; the others were Adventure, Skipper, Hotspur, and The Wizard. Television eventually drew many boys from the story papers and, by 1961, The Rover absorbed Adventure, and by 1963, The Wizard. The Rover limped along for another decade before closing its doors.
Here's the October 29, 1927 issue: