Since CBB10 ended, 5's performance has been pretty dire, getting all day viewing shares ranging from 2.5-3.5%. Yes, we all can say that it's Big Brother overkill, but it's the main show that gets them their figures. For example, these where the ratings for 5 last night:
Meanwhile, World's Strongest Man (665k/2.8%) and Cowboy Builders (582k/2.4%) could only muster meagre numbers on Channel 5.
They had a 2.4% average (+1= 0.2%). It's pretty clear to see that, even if figures are down on last January's CBB, they will be a needed boost.