Sian Polhill-Thomas appeared on Coronation Street between August and November 2011 as a Prison Officer stationed at Norcross Prison during the incarceration of Fiz Stape. She returned to the programme in December 2019 as Lucy Bowerman who negotiated the purchase of the Viaduct Bistro on behalf of Ray Crosby.
Her other credits include roles in Cutting It, Hotel Babylon, New Tricks, Secret Diary of a Call Girl, Holby City, Doctors and a role in the 2010 film Reuniting the Rubens. She also narrated the documentaries Kerry Katona: Coming Clean and Kerry Katona: The Next Chapter.