The National League Four-Team Championship was a contest between teams competing in the British League Division Two/National League in the UK. Eight teams were grouped into fours, with one rider from each team in each race. The winners and second place of each group compete for the Championship in the final. It was known as the National League Four-Team Championship from 1976 until 1990, and as the British League Division Two Four-Team Championship from 1991 until 1994, reflecting the different names used for the league.
References
National League Four-Team Championship Wikipedia(Text) CC BY-SA