[Jason.]

Some stats for all the C5 series:

OVERNIGHT FIGURES

BB AVERAGES 

BIG BROTHER 12 (2011): N/A
BIG BROTHER 13 (2012): N/A
BIG BROTHER 14 (2013): 1.5m [inc. +1]
BIG BROTHER 15 (2014): 1.2m [inc. +1]
BIG BROTHER 16 (2015): 1.1m [inc. +1]

BB LAUNCH NIGHT RATINGS 

BIG BROTHER 12 (2011): 2.6m
BIG BROTHER 13 (2012): 2.7m [inc. +1]
BIG BROTHER 14 (2013): 2.1m [inc. +1]   
BIG BROTHER 15 (2014): 2.1m [inc. +1]
BIG BROTHER 16 (2015): 1.8m [inc. +1]

BB FINAL NIGHT RATINGS 

BIG BROTHER 12 (2011): 2.1m 
BIG BROTHER 13 (2012): 1.5m [inc. +1]
BIG BROTHER 14 (2013): 1.7m [inc. +1]
BIG BROTHER 15 (2014): 1.6m [inc. +1]
BIG BROTHER 16 (2015): 1.3m [inc. +1] 

OFFICIAL FIGURES

BB SERIES AVERAGES 

BIG BROTHER 12 (2011): 1.6m 
BIG BROTHER 13 (2012): 1.6m [inc. +1]
BIG BROTHER 14 (2013): 1.9m [inc. +1]
BIG BROTHER 15 (2014): 1.6m [inc. +1]
BIG BROTHER 16 (2015): 1.4m [inc. +1]

BB LAUNCH NIGHT RATINGS

BIG BROTHER 12 (2011): 2.77m 
BIG BROTHER 13 (2012): 2.93m [inc. +1]
BIG BROTHER 14 (2013): 2.34m [inc. +1] 
BIG BROTHER 15 (2014): 2.43m [inc. +1]                                        
BIG BROTHER 16 (2015): 2.09m [inc. +1]

BB FINAL NIGHT RATINGS

BIG BROTHER 12 (2011): 2.20m 
BIG BROTHER 13 (2012): 1.76m [inc. +1]
BIG BROTHER 14 (2013): 2.20m [inc. +1]
BIG BROTHER 15 (2014): 1.77m [inc. +1]
BIG BROTHER 16 (2015): 1.37m [excl. +1]

I'll be optimistic and predict 2.0m overnight for the launch and 1.5m for the series average officially.