In 1974, Fergusson made her television debut with a few episodes in popular soap Crossroads playing Caroline Herbert, an old girlfriend of main character Roy Mollison, and appeared as Mrs Tremayne, a colonel’s wife, in an episode of All Creatures Great and Small four years later in 1978.
In theatre, she appeared in the stage show of popular long running sitcom Last of the Summer Wine in the 1984 summer season, playing Marina, an ageing blonde bombshell complete with peroxide blonde hair, false eyelashes and short skirt.
After Last of the Summer Wine ended, Fergusson appeared in several television series, including This is England '86 and three episodes of Doctors.
In 2010 she took on the role of Dorothy Hoyle in Coronation Street, having previously played Gary Mallet's mother in 1999 and Dr Lowther's sister-in-law Helen Ashcroft in 1987.
She reappeared in 2011, and was part of a large kidnapping storyline involving her husband Alan, John Stape and Chesney Battersby-Brown.