Mildenhall Fen Tigers beat Dudley Heathens in the play-off final to become champions.
The event was won by Cameron Heeps and Lewis Blackbird of the Mildenhall Fen Tigers.
Mildenhall won the National League Fours, held on 26 August 2012 at Loomer Road Stadium.
King's Lynn Young Stars Mildenhall Fen Tigers Rye House Raiders
Milton Keynes won grand final 21–15[12] List of United Kingdom Speedway League Champions