Helen Elizabeth McCrory (born 17 August 1968) is a British actress. She portrayed Cherie Blair in both The Queen (2006) and The Special Relationship (2010). She also portrayed Narcissa Malfoy in the final three Harry Potter films; Mama Jeanne in Martin Scorsese's family mystery film Hugo (2011); Clair Dowar in Sam Mendes' Skyfall (2012); and Polly Gray in Peaky Blinders (2013–).