Ealing Studios has announced more cast names: hot on the heels of the box office hit 300, Lena Headey will play new teacher, Miss Dickinson; Toby Jones (Harry Potter And The Chamber Of Secrets) will play the school’s Bursar; Celia Imrie (Bridget Jones’ Diary, Calendar Girls) will be the Matron and Anna Chancellor (Four Weddings And A Funeral) will play Miss Bagstock. The six new cast members will join Rupert Everett, Colin Firth, Russell Brand, Caterina Murino, Jodie Whittaker and Stephen Fry on set.