Awards chairman William Russell said, "Brokeback Mountain has all the ingredients of a classic love story, except that the lovers are two young ranch hands who fall in love one summer while herding sheep, but go on to marry and have children, while continuing to meet over the years.
"Ang Lee has succeeded in presenting this highly controversial situation in an intelligent and sensitive fashion, and secured outstanding performances from the entire cast.
"It is a feat which has been rightly recognized."
Elsewhere, Downfall star Bruno Ganz picked up Actor of the Year for his mesmerizing portrayal of Nazi leader Adolf Hitler, while Naomi Watts won Actress of the Year for King Kong at the London ceremony.
The full list of winners is as follows:
Film of the Year - Brokeback Mountain
British actor - Ralph Fiennes (The Constant Gardener)
British producer - Simon Channing Williams (The Constant Gardener)
Foreign Language Film of the Year - Downfall
The Attenborough Award - The Constant Gardener
Dilys Powell Award - Bryan Forbes CBE
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