Whilst a regional T20 tournament was planned for 2020, it was cancelled in favour of the 50-over Rachael Heyhoe Flint Trophy in the shortened 2020 season due to the COVID-19 pandemic.

[4] In 2021, with a return to a full schedule, it was announced in February that the new Twenty20 competition would be called the Women's Regional T20, to run alongside the Rachael Heyhoe Flint Trophy and to be competed for by the same teams.

[8] The Blaze won the title the following year, defeating South East Stars in the final after topping the group stage.

[9] This was the last edition of the competition as the ECB announced it would be replaced by a new T20 Blast as part of a restructuring of women's domestic cricket in England and Wales.

In case of a tie in the standings, the following tiebreakers are applied in order: highest net run rate, team that scored the most points in matches involving the tied parties, better bowling strike rate, drawing of lots.