A now-deleted post by a Reddit user showed another new set being built, which fans have speculated is either wizarding bank Gringotts or the Hut-on-the-Rock - where a young Harry Potter first meets ...

Other productions seen filming in Leavesden this year include G ame of Thrones prequel House of the Dragon and the upcoming Supergirl film. Production is now well under way for HBO's Harry Potter ...