[supertv247]

Launch - 1.6 million overnight (1.75m officially)
Series average - 1.3 million overnight (1.7m officially)

I think it'll launch pretty much the exact same as last year, and will do ever so slightly better in overnights too (if they keep it at 10pm and avoid love island). I think it will add slightly more in catch up figures on top of this (they rise every single series I think) and will therefore average slightly better than the 1.6 avg BB normally gets.
I think launches don't do any special numbers these days and that whatever BB18 gets on launch will be beaten often throughout the series

EDIT: this is if launch is normal (e.g. Tuesday 6th June 9pm) if it's on Sunday, against BGT or love island or at 10pm or something stupid then scrap everything - 1 million