Meryl Streep is Margaret Thatcher July 2, 2010 Will Meryl take on Maggie? Meryl Streep is in talks to play Margaret Thatcher in a biopic. If cast, the actress will be reunited with her Mamma Mia! director Phyllida Lloyd for the project. Jim Broadbent is reportedly playing Thatcher’s husband, Denis. The film is set in the days leading up to the Falklands War in 1982, which helped Thatcher’s government win the following year’s general election.