Actress Meryl Streep won the best actress trophy for playing former British Prime Minister Margaret Thatcher in "The Iron Lady" at the the Orange British Academy Film Awards.

Meryl Streep. Pic/AFP

"The Iron Lady" takes a look at Thatcher's life with a focus on the price she paid for power. Christopher Plummer won the best supporting actor award for his performance in "Beginners", while Octavia Spencer bagged the best supporting actress trophy for her role in "The Help" at a gala ceremony at the Royal Opera House here Sunday.