n 2004, Ellison had a run in the London West End theatre version of the musical "Chicago" at the Adelphi Theatre playing the leading role of Roxie Hart and reprised the role from 10 July to 9 August 2006, this time at the Cambridge Theatre. Ellison was actually supposed to finish on 12 August, but was forced to pull out three days early due to a knee injury. Ellison subsequently toured Britain in "Chicago" from 25 September 2006 until 5 May 2007. On 1 October 2007, Ellison joined the cast of a revival of "Boeing Boeing" at the Comedy Theatre, London, playing the part of Gloria, an American air stewardess working for the airline TWA.