Streep re-teamed with '' Mamma Mia '' director Phyllida Lloyd on '' The Iron Lady '' ( 2011 ) , a British biographical film about Margaret Thatcher , which takes a look at the Prime Minister during the Falklands War and her years in retirement . Streep , who attended a session of the House of Commons to see British MPs in action in preparation for her role as Thatcher , called her casting " a daunting and exciting challenge " . While the film had a mixed reception , Streep 's performance gained rave reviews , earning her Best Actress awards at the Golden Globes and the BAFTAs , as well as her third win at the 84th Academy Awards . Former advisers , friends , and family of Thatcher criticized Streep 's portrayal of her as " inaccurate " and " biased " . The following year , after Thatcher 's death , Streep issued a formal statement describing Thatcher 's " hard-nosed fiscal measures " and " hands-off approach to financial regulation " , while praising her " personal strength and grit "
84th Academy Awards
84th Academy Awards
Meryl Streep