In 1987, Dexter won the Olivier Award for Most Promising Newcomer in Theatre, for her performance in Dalliance the previous year. He other stage credits include the 1994 revival of Oliver! at the London Palladium, and Mrs. Wilkinson in Billy Elliot the Musical, also Lady Macbeth in Macbeth. He other television credits include A Touch of Frost, Have Your Cake and Eat It, Goodnight Sweetheart, The Bill, Night & Day, Family, Jericho, Dalziel and Pascoe, Secret Diary of a Call Girl, Sugar Town, Atlantis, Holby City and Poldark.