Australian movie star Cate Blanchett won the award for Best Actress at BAFTAs on Sunday for her portrayal of a riches-to-rags socialite in Woody Allen's tragic comedy Blue Jasmine.
Blanchett, 44, was favourite to win the prize and is favourite to pick up the same award at the Academy Awards on March 2.
She dedicated the award to actor Philip Seymour Hoffman who died of an apparent drugs overdose two weeks ago.
British actor Chiwetel Ejiofor won the Best Actor award at Britain's top film honours for his role as a free man tricked and sold into bondage in 12 Years a Slave.
Ejiofor, 36, who gained recognition as the lead in the dark 2002 crime thriller Dirty Pretty Things, said he was "deeply honoured and privileged" to receive the award and for having the chance to make "a story of such value".
LIST OF WINNERS AT BAFTAs 2014
BEST FILM: 12 Years a Slave
OUTSTANDING BRITISH FILM: Gravity
BEST DIRECTOR: Alfonso Cuaron for Gravity
LEADING ACTOR: Chiwetel Ejiofor in 12 Years a Slave
LEADING ACTRESS: Cate Blanchett in Blue Jasmine
SUPPORTING ACTOR: Barkhad Abdi in Captain Phillips
SUPPORTING ACTRESS: Jennifer Lawrence in American Hustle
DOCUMENTARY: The Act of Killing
ANIMATED FILM: Frozen
ORIGINAL SCREENPLAY: Eric Warren Singer and David O. Russell for American Hustle
ADAPTED SCREENPLAY: Steve Coogan and Jeff Pope for Philomena
FILM NOT IN THE ENGLISH LANGUAGE: The Great Beauty
ORIGINAL MUSIC: Gravity