I know there was nothing else on at the time, but how long did they persist with 50 seconds of the opening titles with nothing happening?
In those days opening/closing titles were created without thinking “Is the viewer going to switch over?” They were done for stylistic purposes with not much regard to the timing.
Did the long lingering "nothingness" part of the sequence start sufficiently early (e.g. 06:29:15, or similar) to mean that the bit which actually feels like "titles" started at about 06:30:00?
If not, then it would be pretty much 6.31am by the time it got to the studio and presenters.
EDIT: I suppose that long lingering prelude was basically much akin to the ITV regions' "start-up routines", which would have still been a thing in that era.
No, the show started at bang on 0630, meaning that intro would go on until 0631. Remember back then the clock would usually appear before the news and programmes like Grandstand, so it was seen as important that the show would start bang on with the titles, rather than counting down as it were.
If I remember correctly, the opening video would vary day to day to show various sunrises in various locations. It wasn't until 1986, that the opening video was settled.
Night Thoughts and Lou Scannon gave kudos