With Ncuti Gatwa’s Doctor Who debut season behind him, new reports hint that the first major spin-off series, The War Between the Land and Sea, may be preparing to begin production soon. Before returning to his role as showrunner, Russell T Davies stated that he felt that the series could have the potential for numerous ongoing spin-offs alongside the main series. In 2023, the limited spin-off series titled Tales of the TARDIS was released on BBC iPlayer, reuniting past Doctors and companions to look back on fan-favorite stories for the 60th anniversary.
https://screenrant.com/war-between-land-and-sea-filming-september-update-report/