According to figures from media agencies, Big Brother 8 peaked at eight million viewers during the last hour of its first episode, but averaged 6.2 million viewers across the night, a drop on last year's seven million.
Ratings fell to an average of four million on the second night, and remained static through the week, averaging a 15 per cent drop in ratings on the previous year's 4.7 million.
Jason Smith, a TV buyer at Carat, said: "There is fatigue with the format; it just doesn't have the popularity of previous years. But it's still doing healthy numbers and ratings will spike depending what's going on in the house."
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