[11] There were six teams in the Premier Division; Bradford Thunderbirds, Castleford Panthers, Coventry Bears, Featherstone Rovers, Nottingham Outlaws, and Warrington Wolves.

Five teams took part in the Premier Division; Bradford Thunderbirds, Coventry Bears, Featherstone Rovers, Normanton Knights and Thatto Heath.

[15] In 2014, five teams took part in the Premier Division; Bradford Thunderbirds, Crosfields, Featherstone Rovers, Normanton Knights and Thatto Heath.

[17] The 2015 season began on 12 April with 13 teams in the Premier Division; Bradford Thunderbirds, Brighouse Rangers, Featherstone Rovers, Hunslet Hawks, Leigh Miners Rangers, Normanton Knights, Oulton Raidettes, Rochdale Hornets, Selby Warriors, Stanningley, Thatto Heath, West Craven Warriors and Wigan St Patricks.

[21] By the end of the regular season Rochdale Hornets were also unable to play giving West Craven a bye in the first round of the play-offs.

Group 1 league leaders Thatto Heath defeated fourth place Stanningley in the semi-final[30] and retained their title on 1 October with a 36–8 win over Bradford Bulls in the Grand Final.

[9][31] The 2017 season began on 12 March with 11 teams in the Premier Division: Barrow, Batley Bulldogs, Bradford Bulls, Castleford Tigers, Featherstone Rovers, Leigh Miners Rangers, Oulton Raidettes, Stanningley, Thatto Heath, Wakefield Trinity and Wigan St Patricks.