Forsyth's television work includes Whatever Happened to the Likely Lads? as Thelma (1973–74); The Glamour Girls (1980-82) as Veronica Haslett; Tom, Dick and Harriet (1983) as Harriet Maddison; The Practice as Dr. Judith Vincent (1986); Sharon and Elsie as Elsie Beecroft (1984–85); Dark Season (1991) as Miss Maitland; and Boon (ITV, 1989) as Helen Yeldham. She has guested on The Bill; Doctor Who; Dr Finlay's Casebook; Wycliffe; Agatha Christie's Poirot; and also appeared in The Sinners; Holly as the title character Holly Elliot; Adam Smith; Bizarre and Rummage; The Master of Ballantrae; Jackanory; Holding The Fort; Waiting; Dangerfield; Running Wild; The Visit; Graham's Gang; I Told You, Didn't I?; Stanley's Vision as Hilda Spencer; My World; Henry; Nice Town (1992) as Rosemary Dobson; Murder Most Horrid (BBC2, 1996, episode: "A Life Or Death Operation") as Mrs. Osman; Spark (1997) as Mrs. Wells; and Playing the Field (BBC1, 1998) as Francine Pratt. In March 1998, Forsyth made a guest appearance in Coronation Street as Ken Barlow's dating agency client, Babs Fanshawe.