HBO has renewed its forthcoming television adaptation of Harry Potter for a second season months before the first instalment is due to premiere. The network confirmed on Thursday that the second season will begin filming in autumn 2026, ahead of the planned Christmas premiere of season one on HBO Max. HBO has previously said it intends to adapt all seven of J K Rowling’s novels across a decade-long run, with one book forming the basis of each season ; this would make Harry Potter and the Chamber of Secrets the likely focus of the second instalment. Writer Jon Brown, who worked on the first season, has been elevated to co-showrunner alongside Francesca Gardiner. The pair previously collaborated on Succession . Gardiner said the decision reflected the demands of overlapping production schedules as the studio attempts to avoid lengthy breaks between seasons.…