Emma Thompson (Nanny McPhee, Harry Potter and the Prisoner of Azkaban) has been confirmed to take on the role of the iconic school headmaster, Miss Trunchbull, from the Matilda musical and Roald Dahl book it was based on. The news squashes rumours that Ralph Fiennes (Strange Days) would take on the role and comes after it was previously announced that Lashana Lynch (No Time To Die) was in talks to play Miss Honey.