The Provincial League Riders Championship was a contest between the top riders (or two riders) with the highest average points total from each speedway club competing in the Provincial League in the UK, held in each year that the league existed - between 1960 and 1964. The competition was superseded by the British League Riders' Championship in 1965 when the Provincial League merged with the National League to form the British League.
References
Provincial League Riders' Championship Wikipedia(Text) CC BY-SA