1931 Speedway Northern League

Liverpool, Manchester White City, Warrington, Edinburgh, Newcastle, Rochdale Hornets, Barnsley and Wombwell were all no longer participants, while Leeds rejoined after a year's absence.

[3][5] Belle Vue Aces retained their title, Glasgow White City and Leicester Super withdrew in mid-season but their results stood.

[3] The 1931 National Trophy was the first edition of the Knockout Cup.

It was contested between teams from the Southern and Northern Leagues.

[8] For the results of the National Trophy see - 1931 Speedway Southern League Belle Vue Glasgow Leeds Leicester Preston Sheffield