Something I've always found interesting with BA, is that a (presumably most senior) cabin crew member announces 'cabin crew seats for takeoff/landing', the actual indication for just about to enter the runway is via two or three 'bongs' over the PA from the flight deck.

The flight deck have always done the seats for takeoff/landing announcement with all other airlines that I've flown with. This makes more sense imo, the cabin crew can never otherwise be 100% when takeoff is going to commence.