Non-Stop starred the English actress best known for what role in Downton Abbey?
Michelle Dockery Michelle Suzanne Dockery (born 15 December 1981) is an English actress and singer. She is most widely known for her performance as Lady Mary Crawley in the ITV (UK) and PBS (U.S.) television period drama series "Downton Abbey" (2010–15), for which she was nominated for three consecutive Emmy Awards in the category for Outstanding Lead Actress In Drama Series, and a Golden Globe Award nomination. She made her professional stage debut in "His Dark Materials" in 2004. For her role as Eliza Doolittle in the 2007 London revival of "Pygmalion", she was nominated for the Evening Standard Award.
Barbara Windsor Dame Barbara Windsor, DBE (born Barbara Ann Deeks; 6 August 1937) is an English actress, known for her appearances in the "Carry On" films and for playing Peggy Mitchell in the BBC One soap opera "EastEnders". She joined the cast of "EastEnders" in 1994 and won the 1999 British Soap Award for Best Actress. She left the show in 2010, before returning for three episodes between 2013 and 2015. Her character's final appearances were broadcast in June 2016.