 Brett departed "EastEnders" again in 2017; her final episode aired on 23 October 2017.On 15 March 2012, it was announced Brett would be joining the BBC's ongoing drama "Waterloo Road" as Christine Mulgrew, a new English teacher hired by headmaster Michael Byrne (Alec Newman).For the first time in Brett's career, she spoke in her native accent as the show had relocated to Scotland.