Who played Lavinia in The Great St Trinian's Train Robbery?

Lavinia in "The Great St Trinian's Train Robbery" was played by actress Tamsin Egerton. The film, released in 2010, is a comedy that serves as a sequel to the original St Trinian's films. Egerton's character is part of the ensemble cast that brings the story of the mischievous schoolgirls to life.