There are reports coming in that Serenity has managed to knock Pride and Prejudice off the top spot, and earn #1 in the UK Box Office. Official figures are yet to come in, nor even estimates, but its a figure that has begun circulating around the net.
UPDATE: Exact figures
Weekend Total: £958,816
Screens: 355
Screen average: £2,701
Apparently the movie also showed a +39% change from Friday to Saturday!