Past ratings perfomance
 

in rank order
(average per episode)

1. Series 3 - 5.8m
2. Series 5 - 5.0m
3. Series 1 - 4.7m
= Series 7 - 4.7m
5. Series 2 - 4.6m
= Series 4 - 4.6m
7. Series 6 - 4.4m

To date, the highest rated BB series is Series 3, which recorded an staggering average of 5.8 million and a 28% share. The second most popular series was Series 5, which pulled in with an average of 5 million and 25%. Series 7 clawed back viewers last year, with a 4.7 million average. The first and second series performed equally as well, with very slight differences in their figures; series 1 managed 4.7 million (26%), and series 2 entertained 4.6m (24%). The fourth and sixth editions of the show are least popular with fans, and the ratings reflect this. Big Brother 4 managed 4.6 million or 22%, and the sixth series could only muster 4.4 million with the same share. The difference between best and worst is around 1.5m on average. How will Series 8 fare?

http://bbuksite.net/ratings

quite surprising, i thought BB6 was the best season!