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The reality show attracted 10.9m, or 41.9% of the total viewing audience, from 9-10.30pm. The second of the semi-finals will air tonight then the final on Saturday.
One-off crime drama Kiss of Death, on BBC One in the same slot, interested only 3.6m (13.9%).
BBC Two's movie, the recent remake of The Four Feathers, drew 2.1m (8.9%) from 9pm to 11.05pm.
Channel 4 documentary Life After People, which employed CGI to depict Earth in 20100, was watched by 2m (7.8%) from 9pm to 10.35pm while Five doc Warship attracted 1.1m (4%) in the hour from 9pm.
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