Just saw the eye flash and it isnt really an eye flash it is an advert with marcus bently narrating and the big brother theme tune in the back ground
it shows the moving eye first
it also says this:
BIGGEST NAMES
BIGGEST HOUSE
BIGGEST BROTHER
With Marcus Bently saying
its back big brother 2011 coming soon to channel 5
u cant miss it u will hear the theme tune and marcus bently
whoop whoop
EDIT: YouTube clip posted by bobnot.