Gillian Anderson seemed willing to clear her calendar for another season, but Netflix execs saw sense.
Sex Education's second season premiered in January 2020, almost a year after the first.
The coronavirus pandemic delayed filming of season three, which premiered in September 2021.
Season three's delay may have given writers extra time to compose season four, so production could start soon.
First series launched 11 January 2019, second 17 January 2020, third 17 September 2021. 25 September 2021: Fourth series announced.