Firth and Mulligan head film awards list
Firth was honoured for his role as a gay professor in Tom Ford's directorial debut A Single Man, while up-and-coming actress Mulligan received the award for her part in An Education, written by Nick Hornby.
Quentin Tarantino attended the ceremony to pick up its highest honour, the Dilys Powell Award for Excellence in Cinema, for his outstanding contribution to cinema.
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Hide AdThe director, screenwriter, producer and actor was celebrated for his films such as Reservoir Dogs, Pulp Fiction and Kill Bill.
Christoph Waltz, star of Tarantino's latest film Inglourious Basterds, was also honoured at the ceremony, receiving the gong for Actor of the Year.
Actress of the Year award went to Mo'Nique for her performance as an abusive mother in the dark drama Precious.
Gritty British drama Fish Tank received four awards, with Andrea Arnold being named British Director of the Year and Michael Fassbender picking up the British Actor in a Supporting Role award.
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Hide AdNewcomer Katie Jarvis, who landed her debut role as troubled teen Mia in Fish Tank after being discovered arguing with her boyfriend at a train station, received the NSPCC Award for Young British Performer of the Year.
Kathryn Bigelow was given the Director of the Year award for the Iraq war drama The Hurt Locker.