[1] Due to the restrictions on clubs' ability to play matches in the lockdowns associated with the COVID-19 pandemic, competitions at Steps 3–6 were curtailed on 24 February 2021.
[3] The Premier Division Central comprised the same set of 22 teams which competed in the aborted competition the previous season.
The Premier Division South comprised 20 teams, two fewer than the previous season, following Blackfield & Langley's resignation and voluntary relegation to the Wessex League,[5] and Merthyr Town's decision to withdraw for one season due to the effects of the COVID-19 pandemic in Wales.
Division One Central comprised the same set of 20 teams which competed in the aborted competition the previous season.
Division One South comprised the same set of 20 teams which competed in the aborted competition the previous season.