as Prison Governor Sixth Form Lisa Gastoni as Myrna Mangan Rosalind Knight as Annabel Dilys Laye as Bridget Strong Jose Read as Cynthia Pat Laurence as Mavis Sabrina as Virginia Fritton Ministry of Education Richard Wattis as Manton Bassett Eric Barker as Culpepper Brown Peter Jones as Prestwick Michael Ripper as Eric the liftman Production As Miss Fritton, Alastair Sim appears in only two scenes. Oddly he played Millicent Fritton in The Belles of St Trinian's made in 1954 but in Blue Murder at St Trinian's his character is known as Amelia Fritton. A leading model at the time, Sabrina got high billing, appearing in all the posters and publicity stills in school uniform, but she actually had a non-speaking part in which she was only required to lounge in bed reading a book while men hovered around her. She is described as the "school swot", the only pupil to go to bed on time and where she reads the works of Dostoyevsky. Thorley Walters was to re-appear in The Pure Hell of St Trinian's, effectively replacing Richard Wattis as Culpepper-Brown's nerve-racked assistant. He was also to play the part of Culpepper-Brown himself in The Wildcats of St Trinian's in 1980. It was Rosalind Knight's first credited film role. She too later appeared in The Wildcats film, this time as a teacher. Box office Kinematograph Weekly listed it as being "in the money" at the British box office in 1958. Critical reception Bosley Crowther wrote in The New York Times, "what is important and delightful is that the spirit of knockabout farce, evolved in "The Belles of St. Trinian's," is retained uninhibited in this film...it is wild but generally funny—explosively funny in spots, especially when that fellow Terry-Thomas, who was the mustachioed major in "Private's Progress," is dragooned as a bus driver to transport the girls to Rome. And since he has toothy Joyce Grenfell to accompany him on the trip—she's "a crazy, mixed-up police-woman," as she dubs herself—the fun is as much in their behavior as it is in that of the belles. None of the latter is notable as an actress; all are lissome and lively girls. They make for pleasant company on a mad excursion. It's only too bad that Mr. Sim had to languish in jail." More recently, David McGillivray noted in Time Out, "Inventive situations utilising a classic British blend of comedy and crime make