From 1907 until 1973 the Championship was awarded to the team winning a top-four play-off (excluding the 2 seasons 1962–63 and 1963–64, when the championship was awarded to the top-placed team). From 1907 to 1962 no prize was awarded to the team finishing top. From 1965 to 1973 a 'League Leaders' Trophy' was introduced to reward the team finishing top. In 1996,
Super League was formed but continued to use the league to decide the champions until 1998, when they adopted a play-off structure for the championship. Between 1998 and 2002 no trophy was awarded for coming top of the league in the regular season, and it would not be until the 2003 season when the League Leaders' Shield was first awarded. From 2015 to 2017, League Leaders' Shield winners would participate in the short lived
World Club Series. 2015 also saw the prize money increase from £50,000 to £100,000. In 2016, the League Leaders were awarded medals for the first time. == Shield winners ==